Government of the Bahamas v Grand Bahama Port Authority Ltd (UNCITRAL arbitration; award made public in March 2026).  Acting for the private port authority of the city of Freeport, defending a claim for $357m brought by the Bahamian Government under the 1955 Hawksbill Creek Agreement in respect of expenditure on public services and counterclaiming for breaches of that agreement. Contract governed by Bahamian law; Bahamas seated arbitration; tribunal comprised: Sir Anthony Smellie (former Chief Justice of Cayman Islands), Lord Neuberger and Dame Elizabeth Gloster.

Crescent Gas v NIOC [2025] EWCA Civ 1211. Acted for the appellant / defendant, resisting the enforcement of an $2bn arbitration award against English property.  Raised issues of concerning asset transfers, including: agency, manner of execution of documents by companies, validity of declarations of trust and reversal of transactions under s.423, Insolvency Act 1986.

Invest Bank v El-Husseini and others: as junior counsel in the Commercial Court, succeeded, on a preliminary issues trial which engaged expert evidence of UAE law, in establishing that final Abu Dhabi court judgments were enforceable in England at common law notwithstanding that local Abu Dhabi courts had recently refused to enforce them ([2024] 1 WLR 2132). Separately, succeeded in resisting applications for security for costs ([2022] EWHC 3008 (Comm)).

ME v TalkTalk (2022): as sole counsel in Commercial Court proceedings, acting for claimant in dispute over termination of long-running services contract and substantial claim in debt & damages.

Credico Marketing v Lambert and others (2021): High Court (Queen’s Bench) proceedings, acting for a ‘face-to-face’ marketing company in its claims against rival companies and their directors for the torts of procuring breach of contract, misrepresentation, and causing loss by unlawful means.

[Importer & Reseller] v [Luxury New York Fashion Accessories Brand] (2021): as sole counsel in mediation, acting for defendant in a dispute following termination of a long-term agency relationship. Engaged issues of novation / assignment, business valuation and availability of compensation under the Commercial Agents Regulations.

Hussein family v Ahmed family [2021] EWHC 2213 (Ch): as sole counsel in the High Court (Chancery), succeeded for defendants in applications for strike-out, reverse summary judgment and stay of various claims for misrepresentation and unjust enrichment in connection with the sale of restaurant businesses in London.

Invest Bank v El-Husseini and others [2026] AC 1 – junior counsel in the Supreme Court – conducting oral advocacy on appeal on behalf of the respondent UAE bank seeking to enforce Abu Dhabi court judgments and for relief under s.423, Insolvency Act 1986 to recover real estate, shares and cash transferred away by the judgment debtor and his companies.

Condair v Price [2021] EWHC 2461 (QB): as sole counsel in the High Court (Queen’s Bench), secured ex parte freezing injunction and extensive disclosure orders in support of 7-figure claim for embezzlement by a company’s financial controller (engaging issues of proprietary relief, unjust enrichment, constructive trust, deceit, breach of fiduciary duty and breach of contract).

Hussein family v Ahmed family [2021] EWHC 2213 (Ch): as sole counsel in High Court (Chancery), succeeded for the defendants in applications for strike-out, summary judgment and stay of various claims of fraudulent misrepresentation and unjust enrichment in connection with the sale of restaurant businesses in London.

Gray v Hurley [2019] EWCA Civ 2222: the Court of Appeal, representing a claimant in a jurisdiction challenge and anti-suit injunction application in relation to claims of resulting trusts, undue influence and unjust enrichment for recovery of high value real estate, shares and hypercars located abroad (including the Ferrari F1 that Michael Schumacher drove to the 2003 World Championship title).

F v Persons Unknown (2019): as sole counsel in the High Court, secured urgent ex parte freezing injunction for victim of a sophisticated fraud, where the true identity of the fraudster was unknown and had transferred misappropriated funds into Bitcoin.

JSC BTA Bank v Ablyazov and Khrapunov [2020] AC 727: in the Supreme Court, represented the Second Defendant, challenging jurisdiction for a claim of over US$500m+ for unlawful means conspiracy based on alleged breaches of freezing orders.

Invest Bank v El-Husseini and others: as junior counsel in the Commercial Court, succeeded, on a preliminary issues trial which engaged expert evidence of UAE law, in establishing that final Abu Dhabi court judgments were enforceable in England at common law notwithstanding that local Abu Dhabi courts had recently refused to enforce them ([2024] 1 WLR 2132).

PrivatBank v Kolomoisky, Bogolyubov, Teamtrend Ltd and others [2020] Ch 783: as junior counsel in the Court of Appeal, representing corporate defendants incorporated in the BVI in challenging the English Court’s jurisdiction for a US$3billion+ claim for alleged misappropriation of monies from Ukraine’s largest bank prior to its nationalisation.

JSC BTA Bank v Ablyazov and Khrapunov [2020] AC 727: as junior counsel in the UK Supreme Court, represented the Second Defendant resident in Switzerland, in dispute concerning jurisdiction for unlawful means conspiracy.

Marc’s practice spans the entire gamut of gambling disputes:

• Bringing / defending claims for compensation for taking advantage of gambling addictions, often involving complex psychiatric expert evidence.
• Actions for recovery of money from gambling operators in circumstances where money had been misappropriated / stolen and then gambled by the fraudster / thief.
• Disputes over winnings, typically involving interpretation of the rules of games, and of gambling companies’ terms and conditions.

Working on all these different kinds of cases has furnished Marc with a broad and detailed knowledge of the gambling regulatory framework.

Chambers & Partners (2026 edition) describes Marc as “an expert in gambling disputes. He is very strategic and good at pointing out the risks.”

Some of his cases include:

[Private Individual] v Paddy Power (2024): acting unled for a customer in a contractual dispute (engaging aspects of the Consumer Rights Act 2015) against one of the UK’s biggest gambling operator relating to pay out of 6-figure winnings on football accumulator ‘acca’ bets.

Condair v [various gambling operators] (2022-24): as sole counsel, representing company whose ex-employee stole money from it and gambled 6-figure sums at various operators. Company seeks recovery of the money from the operators, alleging breaches of gambling licences (anti-money laundering and social responsibility code provisions) in permitting the ex-employee to gamble with them.

[Individual] v [Online gambling operator] (2021-24): as sole counsel, representing claimant who alleges a gambling addiction and seeks recovery of 6-figure sums gambled online over a period of a few weeks.

[Individual] v [Offshore gambling website] (2020): as sole counsel, advising individual gambler in dispute with offshore company in respect of disputed ‘win’ on online casino game.

Ritz Hotel Casino v Al Geabury [2015] EWHC 2294 (QB). Successfully represented the casino at a six day High Court trial in a claim for unpaid roulette losses against a ‘high roller’ which raised detailed evidential issues about alleged gambling addiction and legal issues concerning the regulation of casinos and their obligations towards their patrons. In finding for the Ritz, Mrs Justice Simler relied upon documentary evidence which had been “painstakingly analysed by Mr Delehanty” (see judgment at para. 16). The defendant’s compliance with his disclosure obligations was scrutinised across a number of hotly contested pre-trial High Court hearings at which Marc, as sole counsel, secured orders for specific disclosure. The case was extensively reported in: The Mirror, The Guardian, The Express, The Mail and The Evening Standard.