Greg Callus joined 5RB in 2015. He specialises primarily in defamation, data protection, freedom of information, privacy, confidentiality, and contempt of court. Under the Cab-Rank Rule, he acts for both claimants and defendants, and frequently appears at hearings concerning the open justice principle (anonymity, reporting restrictions & access to court documents) both for and against the media.
Greg has particular expertise in jurisdiction and conflicts of law in relation to digital technology and non-contractual liability, and has appeared in many of the recent cases on jurisdiction in the High Court and Court of Appeal. He advises frequently on data protection class actions. He is also one of a handful of junior barristers to specialise in electoral law.
Greg is also a contributing editor to The White Book (Contempt of Court: commentary on CPR Part 81 and Section 3C).
Before becoming a barrister, Greg was a Fulbright Scholar at the Columbia University Graduate School of Journalism. On his return from New York, he worked full-time in online community moderation at The Guardian during full-time law school. He was awarded Lord Haldane and Lord Denning Scholarships by Lincoln’s Inn, where he was called to the Bar in 2012.
After pupillage, Greg worked for the senior judiciary at the Royal Courts of Justice: first as the Judicial Assistant to the President of the Queen’s Bench Division (the Rt. Hon. Sir Brian Leveson P); then moving into Private Office as acting Legal Advisor to the Lord Chief Justice of England & Wales (the Rt. Hon. The Lord Thomas of Cwmgiedd CJ). He assisted his judges in cases in the UK Supreme Court, both the Civil and Criminal Divisions of the Court of Appeal, the Court Martial Appeal Court, and Divisional Courts of the Queen’s Bench Division.
From the closure of the Press Complaints Commission in September 2014 until the end of December 2021, Greg was also the inaugural Editorial Complaints Commissioner at the Financial Times. His successor in the role is now 5RB colleague Christina Michalos KC.
For those who care about such things, since 2017 Greg has been listed as a Ranked Junior in Chambers & Partners in both Defamation/Privacy and in Data Protection. He features in the Legal 500 (also since 2017) as a Leading Junior for Defamation & Privacy, and in Who’s Who Legal (since 2019).
Greg is qualified to accept instructions on a Direct Access basis, but now almost invariably does so only in relation to cases he is undertaking pro bono.
- Soriano v Forensic News & ors  EWCA Civ 1952;  2 WLR 807;  EMLR 12; in the Court of Appeal (Dame Victoria Sharp P; Laing & Warby LJJ) for the claimant (leading Ben Hamer). The defendants’ appeals concerning s.9 of the Defamation Act 2013 were dismissed, and the cross-appeal was allowed in respect of the refusal of permission to serve-out the claims under the GDPR (Article 3 – territorial applicability) but refused in respect of the claim in malicious falsehood (Loutchansky malice only). See links to the videos of the hearing here;
- Canary Riverside Estate Mgt Ltd v Coates  EWHC 1505 (Ch): instructed for the Intervenor (led by Philip Rainey KC, but conducting the advocacy on confidentiality) in three conjoined appeals before Michael Green J, including of a confidentiality club order;
- Cruz v Gibraltar Financial Services Commission & ors (2021/GCA/01 and 2021/GCA/02) – appeared for the appellants (led by Desmond Browne CBE KC) in the Court of Appeal of Gibraltar (Sir Maurice Kay P; Sir Patrick Elias JA; Sir Colin Rimer JA) in a 3-day appeal on strike-out of particulars of malice;
- Felstead & ors v Post Office Ltd  EWCA Crim 25 – (led by Edward Henry KC and Richard Bentwood) acting for a barrister in proceedings relating to an allegation of contempt of court;
- Wright v Granath  EWCA 28;  4 WLR 24;  EMLR 11: (led by Adam Wolanski KC) – an appeal on Article 27 of the Lugano Convention, and whether a claim for Negative Declaratory Relief in Norway prevents a libel claim from proceeding in England & Wales;
- Wright v Ver  EWCA Civ 672;  1 WLR 3913;  ILPr 10;  EMLR 28 (led by Adam Wolanski KC), the first appeal on the jurisdiction provisions in s.9 Defamation Act 2013;
- EuroEco Fuels (Poland) Ltd v SSSA  EWCA Civ 1932;  4 WLR 156;  EMLR 9 (led by Adrienne Page KC) – an appeal on the lis pendens provisions of the Brussels Recast Regulation (whether defamation and nuisance claims were ‘related’ under Article 28 BRR);
- Kennedy v National Trust for Scotland  EWCA Civ 648;  QB 663;  2 WLR 275;  EMLR 19 – sole counsel for both appeals in the Court of Appeal, acting for the claimant in a libel, negligent misstatement and DPA claim, stayed on grounds of forum conveniens in favour of the Scottish courts;
- Re J (Children)  EWCA Civ 1335;  3 FCR 556 (led by Benjamin Williams KC in the Court of Appeal), on costs arising from Children Act 1989 proceedings involving the media in the Family Division;
- DSM SFG Group Holdings v Kelly  EWCA Civ 2256;  EMLR 10 (led by David Sherborne) on release from undertakings pending trial of a breach of confidence claim;
- Cartier International AG & ors v British Telecommunications plc  UKSC 28;  1 WLR 3259;  All ER 373;  EMLR 22, in the UK Supreme Court on appeal from the Court of Appeal in Cartier & ors v BSkyB & ors  EWCA Civ 658;  1 All ER 700;  EMLR 23 – sole counsel for Open Rights Group (Intervener) at both appellate stages in a case concerning jurisdiction and costs-burden in web-blocking injunctions brought against Internet Service Providers;
- Bukovsky v Crown Prosecution Service  EWCA Civ 1529;  4 WLR 13;  1 Cr App R 15;  EMLR 5 – sole counsel in the Court of Appeal, concerning meaning in libel & the test for appellate review of meaning;
- Lownie v (1) Information Commissioner (2) Foreign & Commonwealth Office; (3) National Archives  EWCA Civ 599 – sole counsel for the appellant, seeking permission to bring a second appeal to the Court of Appeal in respect of ss.23 and 24 FOIA and Article 10 ECHR (post-Magyar), refused by Dingemans LJ after an oral permission hearing;
- R v Peckam (James)  EWCA Crim 2430 (led by William Hughes KC) – application for permission to appeal against sentence.
High Court Trials
- Craig Wright v Peter McCormack  EWHC 2068 (QB) – junior counsel for the Claimant (led by Adam Wolanski KC, with Lily Walker-Parr), conducting part of the closing argument on scale of publication, at a trial before Chamberlain J;
- HM Attorney General v Tina Malone  EWHC 3726 (QB) – junior counsel for Tina Malone (led by Adam Speker KC) in an application before the Divisional Court (the Lord Chief Justice, Lord Burnett of Maldon CJ & Warby J) for committal for contempt for breach of the Venables & Thompson injunction;
- Jack Monroe v Katie Hopkins  EWHC 433 (QB);  4 WLR 68;  EMLR 16; and  EWHC 645 (QB);  1 WLR 3587 – acted for the claimant (led by William Bennett) awarded damages after a libel trial before Warby J concerning publications on Twitter;
- Keith Singh v Joseph Weayou  EWHC 2101 (QB) – sole counsel at trial for the claimant, who was awarded damages by Nicola Davis J for libel and malicious falsehood, and indemnity costs;
- Vladimir Bukovsky v Crown Prosecution Service  EWHC 1926 (QB) – sole counsel at trial of meaning as a preliminary issue in a libel action before Warby J;
- Jake Wallis Simons v Craig Murray (2017)- sole counsel for the Claimant in a libel claim: the case settled first day of trial before Sir David Eady (7 November 2017).
- Svante Kumlin & anor v Jonsson & ors  EWHC 1095 (Admin);  EMLR 20– acting for the defendants (leading Ben Gallop), who publish as Realtid in Sweden, on their two-day CPR Part 11 application before Julian Knowles J, in a libel claim said to be worth more than £13 million brought in England & Wales under Article 7(2) Brussels Recast Regulation;
- Anar Mahmudov & Nargiz Mahmudova v Goni Sanzberro & ors  EWHC 3433 (QB);  4 WLR 29 – sole counsel, acting for all defendants in their CPR Part 11 challenge to the last media case brought under Article 7(2) of the Brussels Recast Regulation;
- Walter Soriano v Silverstein  EWHC 873 (QB) – acted for the claimant (leading Ben Hamer) in an application before Johnson J to serve-out a libel claim against the US-based sixth defendant under s.9 Defamation Act 2013, within the same proceedings as Soriano v Forensic News.
- Walter Soriano v Forensic News & ors  EWHC 56 (QB) – appeared for the claimant (leading Ben Hamer) before Jay J in a 2-day contested application to serve data protection, malicious falsehood, libel, harassment and privacy claims out of the jurisdiction. First judgment where a claimant succeeded in surpassing the s.9 Defamation Act 2013 threshold. Upheld on appeal, and cross-appeal allowed in part:  EWCA Civ 1952;  2 WLR 807;  EMLR 12;
- Napag Trading Ltd & ors v GEDI & SEIF  EWHC 3034 (QB);  EMLR 6 – sole counsel for the Second Defendant on a 2-day jurisdiction application before Jay J concerning libel claims and Article 7(2) Brussels Recast Regulation;
- Craig Wright v Magnus Granath  EWHC 51 (QB);  4 WLR 28;  ILPr 21;  EMLR 11 – (led by Adam Wolanski KC) resisting a challenge to jurisdiction under Article 27 Lugano Convention, overturned on appeal by the Court of Appeal  EWCA Civ 28;  4 WLR 24;  EMLR 11;
- Craig Wright v Roger Ver  EWCA Civ 672;  1 WLR 3913;  ILPR 10;  EMLR 28 (led by Adam Wolanski KC) in the first appeal on s.9 Defamation Act 2013;
- EuroEco Fuels (Poland) Ltd v SSSA  EWCA Civ 1932;  4 WLR 156;  ILPr 18;  EMLR 9 (led by Adrienne Page KC) on Article 30 Brussels Recast Regulation, reversing the decision of Nicol J;
- Ramona Ang v Reliantco Investments Ltd  EWHC 879 (Comm);  QB 582;  3 WLR 161;  2 All ER (Comm) 958;  1 CLC 667 – instructed for the claimant (led by Prof. Jonathan Harris KC & Zahler Bryan) on the data protection element of a jurisdiction challenge;
- Wafic Said v Groupe L’Express  EWHC 3953 (QB);  ILPr 20;  EMLR 9 – sole counsel for the French Defendants, before Nicol J, resisting jurisdiction of the English courts in a claim in defamation and data protection;
- Azra Sabados v Facebook Ireland Ltd  EWHC 2369 (QB);  WTLR 1361 – sole counsel, before HHJ Parkes KC (sitting as a Judge of the High Court). Obtained a Norwich Pharmacal order against an Irish-domiciled defendant for the identity of a person unknown who was alleged to have maliciously procured the deletion of a deceased’s social media profile;
- Howard Kennedy v National Trust for Scotland  EWHC 3368 (QB);  EMLR 13 – sole counsel for the Claimant on the Defendant’s application for a stay on the grounds of forum non conveniens in favour of the Scottish courts, heard by Sir David Eady and later by the Court of Appeal:  EWCA Civ 648;  QB 663.
- Fortescue Metals Group & anor v (1) Argus Media Ltd (2) S&P Global Inc  EWHC 1304 (Ch) &  EWHC 1333 (Ch) – acted for the Second Defendant (led by Andrew Caldecott QC) resisting an application for an injunction in a commercial breach of confidence & Trade Secrets Regulation claim;
- Nick Ramsay MS v Monmouth Conservative Association  EWHC 3655 (Ch): (leading Ben Gallop) resisting an application (ultimately withdrawn) by a Member of the Senedd for a High Court injunction to prevent a Special General Meeting of his association to consider a petition that might ultimately lead to his de-selection;
- Workspace Commerce Ltd v Filis  EWHC 2923 (QB) – sole counsel for the Defendant, resisting an application before Nicklin J for an injunction in libel, malicious falsehood, harassment, trespass, breach of confidence and tortious interference;
- ZYT & BWE v Associated Newspapers  EWHC 1162 (QB) – junior counsel for respondents (led by Desmond Browne CBE KC) in a privacy claim;
- AQA v Newsquest (unreported) – sole counsel, obtained a without-notice High Court privacy injunction against the media for a witness who was seeking anonymity in relation to a coroner’s inquest.
- Wright v McCormack  EWHC 2671 (QB);  EMLR 10 – junior counsel for the claimant (with Lily Walker-Parr, led by Adam Wolanski KC) before Julian Knowles J at a PTR seeking to strike-out pleadings and witness evidence. The judgment is a leading decision on the operation of the Rule in Dingle and the Rule of Isolation;
- Hunter v Cooper  EWHC 1105 (QB) and  EWHC 1651 (QB) – counsel for D1 (co-counsel with Tom Cross for all Ds), on a strike-out & summary judgment application in respect of libel and slander claims.
- Rosa Malaga Cano v Beatriz Barclay & ors  EWHC 1498 (QB) and  EWHC 3562 (QB) – sole counsel for 12 defendants, striking out claims in slander, libel, breach of contract, assault & battery;
- Nick Cruz v Gibraltar Financial Services Commission (2018-ORD-091) – junior counsel for the defendants (led by Desmond Browne CBE KC) in a heavy strike-out and summary judgment application in the Supreme Court of Gibraltar.
- RJ v Tigipko (Publicity)  EWHC 105 (Fam);  4 WLR 68 and RJ v Tigipko (Redactions)  EWHC 448 (Fam);  3 FCR 470 – applications for publicity in Children Act 1989 proceedings in the High Court (Family Division);
- HRH Louis Xavier Marie Guillaume, Prince of Luxembourg, Prince of Nassau and Prince of Bourbon-Parma v HRH Tessy, Princess of Luxembourg, Princess of Nassau and Princess of Bourbon-Parma  EWHC 3095 (Fam);  4 WLR 223;  2 FLR 280 – sole counsel, acted for Telegraph Media Group Ltd in application to restrict reporting of financial remedies proceedings in the High Court (Family Division);
- Alcott v Ashworth (No 2)  EWHC 2414 (Fam), sole counsel, acted for News Group Newspapers & Times Newspapers Ltd in applications to allow publication of reports of a Hague Convention case.
Judicial Review & Election Law
- Nick Ramsay MS v Hacket Pain (as representative of the Monmouth Conservative Association)  EWHC 3655 (Ch): (leading Ben Gallop) resisting an application (ultimately withdrawn) by a Member of the Senedd for a High Court injunction to prevent a Special General Meeting of his association to consider a petition that might ultimately lead to his de-selection. A subsequent contempt application (for failure to issue the claim form as undertaken, or to pay the costs ordered) was withdrawn at a hearing before Marcus Smith J;
- R (BBC) v Newcastle Crown Court  EWHC 2756 (Admin);  1 Cr. App. R 16;  Crim LR 247;  EMLR 8 – junior counsel for the BBC (led by Gavin Millar KC) in a judicial review by a Divisional Court (Leggatt LJ & Picken J) on the power of the Crown Court to grant journalistic Production Orders under s.9 and Schedule 1 PACE;
- Kevin Painter v Stephen Hirst (2019) – sole counsel for the respondent to a local government election petition and application for a Protective Costs Order in the Divisional Court (Supperstone & Robin Knowles JJ);
- Tim Ireland v Nadine Dorries  EWHC 2781 (QB);  1 WLR 571 – junior counsel for Nadine Dorries MP (led by Gavin Millar KC) in the dismissal of a Parliamentary election petition in the Divisional Court (Popplewell & Jeremy Baker JJ);
- R (ex parte Hassan) v BBC  EWHC 4204 (Admin) – appeared as sole counsel for the BBC in resisting an application for permission to bring Judicial Review of a TV Licensing decision;
- Instructed by a claimant on a Judicial Review of a Magistrates’ Court which granted an ex parte application for an extention of time to bring a prosecution for electoral offences, under s.176 Representation of the People Act 1983. After permission was given by Julian Knowles J, the s.176 order was quashed by consent of all parties.
- Millicom Services UK Ltd & ors v Clifford  EAT 74: appeared for the Claimant (leading Ben Hamer) in a part-allowed appeal of a refuse of a Rule 50 RRO before Eady P. The Court of Appeal (Simler LJ) has given C permission to appeal;
- Guardian News & Media v (1) Rozanov & (2) EFG Private Bank Ltd  EAT 12;  ICR 973;  IRLR 482: appeared for the appellant in the first decision of the Employment Appeal Tribunal (HHJ James Tayler) on the ‘access to documents’ facet of open justice, overturning the decision of the Employment Tribunal below;
- (1) Williams (2) Wickham-Jones & (3) Lownie v (1) Information Commissioner & (2) Foreign, Commonwealth & Development Office  1 WLR 1132 – appeared for the Third Appellant in a hearing of a preliminary issue in three consolidated appeals in the First-Tier Tribunal (Judges Snelson & MacMillan  UKFTT 2019_212 (GRC)) and in the Upper Tribunal (Farbey J, UTJJ Mullan & Wilkie  UKUT 248 (AAC));
- Lownie v Foreign & Commonwealth Office & ors  UKUT 32 (AAC);  1 WLR 3319 – sole counsel in appeal from a Decision Notice of the Information Commissioner on a FOIA request for material from a vetting file held on a now-deceased civil servant suspected of espionage. The FTT allowed the appeal on s.38 FOIA (Health & Safety), upheld the Decision Notice under s.23 (National Security), but gave permission to appeal against its own decision to the Upper Tribunal, who refused the appeal. Dingemans LJ directed and heard an oral application for permission to bring a second appeal to the Court of Appeal, which was refused:  EWCA Civ 599.
- BBC v Independent Office of Police Conduct  UKFTT 2018_0163 (GRC) – sole counsel in the first appeal of an IOPC Information Notice under para 19ZA of Schedule 3 of the Police Reform Act 2002;
- D v Information Commissioner  UKUT 441 (AAC) – sole counsel in an anonymity appeal from the FTT. The Upper Tribunal gave permission for a second appeal to the Court of Appeal.
- R v Hamayoon & Syed (‘the Poppy Terror Trial’) acted for media (BBC, Associated Newspapers, Times Newspapers, News Group Newspapers) in lifting Reporting Restrictions (Woolwich Crown Court);
- R v Murphy & Smith – acted for The Sun in resisting witness anonymity for Danny Cipriani in the trial of his blackmailers (Richmond Crown Court).
- R v Dering & ors – acted for the BBC in relation to lifting section 4(2) Contempt of Court Act 1981 orders in linked trials at different Crown Courts (Southwark & Croydon) of conjoined fraud conspiracies;
- R v Shaw – resisted a witness summons for unbroadcast material on behalf of the BBC (Inner London Crown Court);
- R v Barnes & Wilkinson – set-aside a witness summons on behalf of the BBC (Central Criminal Court);
- R v Jones (aka Bennell) – resisting PACE Production Order applications made at-trial against The Guardian and BBC (Liverpool Crown Court);
- R v Higgins – resisting a s.4(2) order for the BBC (Salisbury Crown Court);
- R v Ormond – resisting a PACE Production Order application made at trial against the BBC (Newcastle Crown Court);
- R v Rahman – setting-aside a witness summons against the media (Minshull St. (Manchester) Crown Court);
- R v Whiddett – setting aside a s.11 order for The Sun & the Daily Mail (Croydon Crown Court).
- Instructed for Laurence Fox in three libel claims and counterclaims arising out of Twitter publication: Blake, Seymour & Thorp v Fox  EWHC 3463 (QB);  4 WLR 77;
- Sarah Ferguson v Mazher Mahmood & News Group Newspapers – instructed for the claimant (led by Andrew Hunter KC & Stephen Ferguson) in a case over the ‘Fake Sheikh’ sting of the Duchess of York;
- Instructed on a number of civil cases arising out of Image-Based Sexual Abuse (sometimes called ‘Revenge Porn’), including Chrissy Chambers v DCR & VHP (led by Alexandra Marzec) and Douglas (Administratrix of the Estate of Susanne Hinte) v News Group Newspapers (sole counsel), both of which led to settlement and a Statement in Open Court;
- Acted for the daughter of Kristen Bell & Dax Shepard, setting a claim against Associated Newspapers;
- Instructed by the Amec Part 20 Defendants (led by James Nadin) in respect of defamation contribution claims brought by other construction firms in the Construction Industry Vetting Information Group Litigation arising out of the 2009 ICO investigation into ‘blacklisting’;
- Alexander Perepilichnyy Inquest – sole counsel, application to the Coroner for documents on behalf of BuzzFeed News UK;
- Harper v Capita (unreported) resisted an Unjust Enrichment claim for recovery of overpaid TV licence payments;
- dispute concerning s.25 Sale of Goods Act 1979 (retention of title clause) in relation to film-set scaffolding;
- prevented an auction of trademarked items in breach of licence;
- resisting enforcement of foreign judgments at common law;
- defended US$500,000 IFTA arbitration over movie rights, on the basis of the rule in ‘The Golden Victory’  2 AC 353;
- trade secrets claim (breach of confidence by commercial competitors).