Call 2019
George Hack
Team Leader
+44 (0)207 842 3762
Click here to email
Dilly Stewart
Team Leader Assistant
+44 (0)20 3873 6858
Click here to email
Marcus has a broad commercial practice with particular emphasis on banking/financial disputes, civil fraud and international arbitration.
He regularly appears in the Commercial Court, including in some of its most prominent and high-value cases, and has experience of arbitrations under many of the major institutional rules.
Before coming to the Bar, Marcus practised as a solicitor advocate at Slaughter and May.
Grenfell Tower litigation
Appearing for the Arconic Defendants in relation to a £360m claim arising out of sales of aluminium composite material used in the cladding of Grenfell Tower prior to a devastating fire which killed 72 people (with David Thomas KC, Laura John KC, Charlie Thompson and Lars Gladhaug). The Claimants’ claim is based in part on extensive fraudulent implied misrepresentations allegedly made by the Arconic Defendants regarding the fire safety of their product.
Offshore cryptocurrency dispute
Acting for a Cayman fund and a commodities trading business in relation to allegations that they have been concerned in a fraud relating to circa US$450 million of assets allegedly forming part of the reserves backing a stablecoin (with Richard Lissack KC). The case has involved proceedings in the Grand Court of the Cayman Islands, the DIFC’s Digital Economy Court and the High Court in Hong Kong.
Loreley Financing v Credit Suisse [2023] EWHC 2759 (Comm)
Appearing for the successful defendant bank in relation to allegations that it made fraudulent misrepresentations as to the credit quality of US$100 million of residential mortgage-backed securities (with Patrick Goodall KC, Adam Sher and Laurie Brock). The claim was selected as one of The Lawyer’s top 20 cases for 2023 and was dismissed in full following a nine-week trial in the Commercial Court.
Banca Intesa v Comune di Venezia [2022] EWHC 2586 (Comm); [2023] Bus LR 384
Appearing for the successful defendant, an Italian municipal authority, in relation to its circa €125 million swap dispute with two banks which culminated in a five-week Commercial Court trial in the summer of 2022 (with Raymond Cox KC and Simon Paul). The case involved complex issues of private international law and the law of restitution. Marcus also appeared for the respondent authority during a four-day appeal against the judgment in October 2023.
International arbitration
Acting for a Swiss energy company in relation to a series of arbitrations under the LMAA, LCIA and ICC rules (with Alexander Milner KC and Max Kasriel). The arbitrations arose out of differences concerning the impact of sanctions on contracts to which the client is party. The combined value of the disputes is understood to exceed £1 billion.
SCC Rules
Acting for an IT company in relation to its circa $30 million claim against a subcontractor in an arbitration under the SCC Rules (with Anneliese Day KC, Alexander Milner KC and Nik Yeo). The dispute arose from an unsuccessful project to produce software for use in bank payment systems.
Banca Intesa v Comune di Venezia [2022] EWHC 2586 (Comm); [2023] Bus LR 384
Appearing for the successful defendant, an Italian municipal authority, in relation to its circa €125 million swap dispute with two banks which culminated in a five-week Commercial Court trial in the summer of 2022 (with Raymond Cox KC and Simon Paul). The case involved complex issues of private international law and the law of restitution. Marcus also appeared for the respondent authority during a four-day appeal against the judgment in October 2023.
Loreley Financing v Credit Suisse [2023] EWHC 2759 (Comm)
Appearing for the successful defendant bank in relation to allegations that it made fraudulent misrepresentations as to the credit quality of US$100 million of residential mortgage-backed securities (with Patrick Goodall KC, Adam Sher and Laurie Brock). The claim was selected as one of The Lawyer’s top 20 cases for 2023 and was dismissed in full following a nine-week trial in the Commercial Court.
Offshore cryptocurrency dispute
Acting for a Cayman fund and a commodities trading business in relation to allegations that they have been concerned in a fraud relating to circa US$450 million of assets allegedly forming part of the reserves backing a stablecoin (with Richard Lissack KC). The case has involved proceedings in the Grand Court of the Cayman Islands, the DIFC’s Digital Economy Court and the High Court in Hong Kong.
Banking software dispute
Acting for an IT company in relation to its circa US$30 million claim against a subcontractor in an arbitration under the SCC Rules (with Anneliese Day KC, Alexander Milner KC and Nik Yeo). The dispute arose from an unsuccessful project to produce software for use in bank payment systems.
Dispute regarding bank account closures
Acting for a major telecoms business seeking urgent injunctive relief to maintain its banking facilities in the face of its bank’s decision to close its accounts (with Robin Barclay KC).
CFD dispute
Acting (as sole counsel) for a CFD trading platform in relation to a claim alleging that the platform had been negligent in failing to identify that funds paid to it had been misappropriated by a director of the claimant.
Titan Wealth Holdings Ltd v Okunola [2024] EWHC 2718 (KB)
Appearing for two companies providing services to the wealth management industry and two individuals in relation to their claims against a former employee (with Robin Lööf). The Claimants successfully obtained extensive injunctive relief, damages and indemnity costs following a trial in October 2024. Marcus also appeared at a series of interim and enforcement hearings, including at a hearing on 12 February 2025 which resulted in the committal of the Defendant to prison for six months for contempt of court, and at a two-day appeal in relation to an interim application which was heard in February 2026.
Grenfell Tower litigation
Appearing for the Arconic Defendants in relation to a £360m claim arising out of sales of aluminium composite material used in the cladding of Grenfell Tower prior to a devastating fire which killed 72 people (with David Thomas KC, Laura John KC, Charlie Thompson and Lars Gladhaug). The Claimants’ claim is based in part on extensive fraudulent implied misrepresentations allegedly made by the Arconic Defendants regarding the fire safety of their product.
Offshore cryptocurrency dispute
Acting for a Cayman fund and a commodities trading business in relation to allegations that they have been concerned in a fraud relating to circa US$450 million of assets allegedly forming part of the reserves backing a stablecoin (with Richard Lissack KC). The case has involved proceedings in the Grand Court of the Cayman Islands, the DIFC’s Digital Economy Court and the High Court in Hong Kong.
Loreley Financing v Credit Suisse [2023] EWHC 2759 (Comm)
Appearing for the successful defendant bank in relation to allegations that it made fraudulent misrepresentations as to the credit quality of US$100 million of residential mortgage-backed securities (with Patrick Goodall KC, Adam Sher and Laurie Brock). The claim was selected as one of The Lawyer’s top 20 cases for 2023 and was dismissed in full following a nine-week trial in the Commercial Court.
NOx emissions group litigation
Acting for Peugeot, Citroën and DS (one of the Lead Defendant groups) in relation to the eight-week quantum trial listed for one of the UK’s largest ever group litigations (with John Taylor KC, James Cutress KC and Chris Monaghan). The Claimants allege that the Defendants installed prohibited defeat devices in millions of diesel vehicles and then made fraudulent misrepresentations to customers regarding the vehicles’ environmental performance, resulting in billions of pounds of losses.
Onecom Group Ltd v Palmer
Acting for an entrepreneur in relation to a series of claims and counterclaims arising out of the sale of one of his businesses, including claims for unlawful means conspiracy, breach of confidence and breach of warranty (with Derrick Dale KC). Marcus appeared for two of the Defendants successfully to defeat an urgent interim injunction application made against them in late 2024.
Offshore company ownership dispute
Acting for a Monaco-based investor in relation to allegations that ownership of a valuable Panamanian company had been fraudulently obtained by a third party by the wholesale deployment of forged documents and perjured testimony (with Richard Lissack KC). The dispute involves expert evidence regarding the authenticity of key transactional documents and parallel proceedings in various jurisdictions.
Grenfell Tower litigation
Appearing for the Arconic Defendants in relation to a £360m claim arising out of sales of aluminium composite material used in the cladding of Grenfell Tower prior to a devastating fire which killed 72 people (with Laura John KC, Charlie Thompson and Lars Gladhaug). The Claimants’ claim is based in part on extensive fraudulent implied misrepresentations allegedly made by the Arconic Defendants regarding the fire safety of their product.
NOx emissions group litigation
Acting for Peugeot, Citroën and DS (one of the Lead Defendant groups) in relation to the eight-week quantum trial listed for one of the UK’s largest ever group litigations with many billions of pounds in damages allegedly due (with John Taylor KC, James Cutress KC and Chris Monaghan). The Claimants allege that the Defendants installed prohibited defeat devices (“PDDs”) in millions of diesel vehicles and that these have affected the value of the vehicles. The quantum trial raises numerous legal and factual issues as to how any impact of PDDs on the value of the vehicles, or other loss, could be quantified.
IT project
Acting for an IT company in relation to its circa US$30 million claim against a subcontractor in an arbitration under the SCC Rules (with Anneliese Day KC, Alexander Milner KC and Nik Yeo). The dispute arose from an unsuccessful project to produce software for use in bank payment systems.
Sanctions
Acting for a Swiss energy company in relation to a series of arbitrations under the LMAA, LCIA and ICC rules (with Alexander Milner KC and Max Kasriel). The arbitrations arose out of differences concerning the impact of sanctions on contracts to which the client is party. The combined value of the disputes is understood to exceed £1 billion.
Onecom Group Ltd v Palmer
Acting for an entrepreneur in relation to a series of claims and counterclaims arising out of the sale of one of his businesses, including claims for unlawful means conspiracy, breach of confidence and breach of warranty (with Derrick Dale KC). Marcus appeared for two of the Defendants successfully to defeat an urgent interim injunction application made against them in late 2024. He also appeared at the two-week trial of the warranty claims in July 2026 (judgment awaited).
Offshore company ownership dispute
Acting for a Monaco-based investor in relation to allegations that ownership of a valuable Panamanian company had been fraudulently obtained by a third party by the wholesale deployment of forged documents and perjured testimony (with Richard Lissack KC). The dispute involves expert evidence regarding the authenticity of key transactional documents and parallel proceedings in various jurisdictions.
Dispute regarding bank account closures
Acting for a major telecoms business seeking urgent injunctive relief to maintain its banking facilities in the face of its bank’s decision to close its accounts (with Robin Barclay KC).
Titan Wealth Holdings Ltd v Okunola [2024] EWHC 2718 (KB)
Appearing for two companies providing services to the wealth management industry and two individuals in relation to their claims against a former employee for breach of confidence, breach of contract and harassment (with Robin Lööf). The Claimants successfully obtained extensive injunctive relief, damages and indemnity costs following a trial in October 2024. Marcus also appeared at a series of interim and enforcement hearings, including at a hearing on 12 February 2025 which resulted in the committal of the Defendant to prison for six months for contempt of court, and at a two-day appeal in relation to an interim application which was heard in February 2026.
CFD dispute
Acting (as sole counsel) for a CFD trading platform in relation to a claim alleging that the platform had been negligent in failing to identify that funds paid to it had been misappropriated by a director of the claimant.
Share ownership dispute
Acting for an early-stage investor in a forex business in relation to a dispute as to the terms of an oral share purchase agreement and an unfair prejudice petition (with Edward Levey KC).
Renewable energy
Appearing for an insurer in relation to a circa £16 million claim under the Third Parties (Rights against Insurers) Act 2010 arising out of a sophisticated renewable energy project (with Ben Lynch KC).
COVID-19 / business interruption insurance
Advising a group of companies in relation to their claims under a business interruption insurance policy, resulting in successful settlement of the dispute with their insurer (with Ben Lynch KC).
Brokerage dispute
Advising six major insurers in relation to a claim for the return of brokerage received by a broker following the avoidance of the underlying policies (with Ben Lynch KC).
Political risks
Assisting with the preparation of witness evidence for a $100 million arbitration regarding representations made in respect of a political risks insurance policy.
Directors’ and officers’ liability
Advising a FTSE 100 company in relation to its claim under a directors’ and officers’ liability policy (as a solicitor).
LMAA/LCIA/ICC Rules
Acting for a Swiss energy company in relation to a series of arbitrations under the LMAA, LCIA and ICC rules (with Alexander Milner KC and Max Kasriel). The arbitrations arose out of differences concerning the impact of sanctions on contracts to which the client is party. The combined value of the disputes is understood to exceed £1 billion.
ICC Rules
Acting for an energy company in relation to its circa US$93 million claim arising out of refusal to accept coal shipments (with Stephen Moriarty KC).
SCC Rules
Acting for an IT company in relation to its circa US$30 million claim against a subcontractor in an arbitration under the SCC Rules (with Anneliese Day KC, Alexander Milner KC and Nik Yeo). The dispute arose from an unsuccessful project to produce software for use in bank payment systems.
LCIA Rules
Sitting as Tribunal Secretary in an arbitration regarding two commercial contracts relating to the promotion of an Angolan business.
Proceedings in support of arbitration
Assisting a respondent to an application for relief in support of a US$400 million arbitral award (as a pupil).
Grenfell Tower litigation
Appearing for the Arconic Defendants in relation to a £360m claim arising out of sales of aluminium composite material used in the cladding of Grenfell Tower prior to a devastating fire which killed 72 people (with David Thomas KC, Laura John KC, Charlie Thompson and Lars Gladhaug). The Claimants’ claim is based in part on the Arconic Defendants’ allegedly negligent failure to warn customers of the alleged dangers of their product.
CFD dispute
Acting (as sole counsel) for a CFD trading platform in relation to a claim alleging that the platform had been negligent in failing to identify that funds paid to it had been misappropriated by a director of the claimant.
Construction
Acting (as sole counsel) for one of the defendants to a claim arising out of an allegedly negligent home renovation.
IT project
Acting for an IT company in relation to its circa US$30 million claim arising out of a subcontractor’s negligence in delivering an IT project (with Anneliese Day KC, Alexander Milner KC and Nik Yeo).
Wasted costs
Acting for a barrister in relation to complex and high-value wasted costs applications (with John Taylor KC).
On 25 October 2024, Mrs Justice Hill handed down judgment in Titan Wealth…
We were pleased to host a double celebration at our annual party…
On 3 November 2023, Mrs Justice Cockerill handed down judgment in Loreley…
George Hack
Team Leader
+44 (0)207 842 3762
Click here to email
Dilly Stewart
Team Leader Assistant
+44 (0)20 3873 6858
Click here to email
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