Fiona is a versatile barrister with a broad commercial practice and is regularly instructed as led and unled counsel in cases of the utmost importance, including in the Supreme Court. Fiona has a particular focus on contractual disputes largely in the sectors of energy, construction/shipbuilding, technology and international trade. She regularly advises on jurisdictional disputes and strategies related to cross-border matters. Fiona is recognised as a leading junior in Commercial Litigation (Legal 500, 2026) and has extensive experience of different arbitral rules.
Before joining Chambers, Fiona was a policy advisor to the UK government, where she led a complex IT procurement project and the commercialisation of a multi-billion-pound government programme. She also taught law at a leading German university (world trade law, EU law and English public law).
An active publisher, Fiona has contributed to the foremost authority on the conflict of laws, Dicey on Conflicts. She also contributed to the White Book 2019 on issues of European jurisdiction and service, and Cullen on Freedom of Information in the UK.
Fiona prides herself on being a flexible, personable barrister who is quick to grasp points and easily able to integrate into teams. She also accepts arbitral appointments.
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Commercial
- Finastra v CRDB Bank plc: led by Lawrence Akka KC acting for the claimant in a licensing dispute about banking software.
- Export-Import Bank of India v Arcelormittal Nippon Steel Middle East FZE: Led by Rishab Gupta defending claims for payment under loan agreements.
- The British Broadcasting Corporation v Arqiva: led by Lawrence Akka KC acting for the claimant in a non-performance dispute about television and radio transmission services.
- A v B (non-contentious): led by Paul Lowenstein KC, advising on prospects of rescinding a multi-billion-euro Share Purchase Agreement.
- A v B (non-contentious): led by Wendy Miles KC alongside Fiona Petersen, advising on prospective claims arising from the wrongful termination of long-term educational supply agreements.
- Sangamo Corp v Properity Overseas SA: led by Oliver Caplin KC, acting for the defendant in a family trust dispute.
- A v B (ad hoc arbitration): led by Robert Howe KC and Christopher Newman, we successfully obtained injunctive relief enforcing post-termination restrictive covenants against a departing partner from one of the Big Four accountancy firms.
- A v B (DIFC-LCIA arbitration): led by Harris Bor acting for the claimant in a dispute over breach of a joint venture agreement.
- A v B (LCIA arbitration): acting for the claimant in a dispute arising out of a share purchase agreement.
- Sports Structures Education Community Interest Company v Bluebank Solutions Ltd t/a Select Energy Direct: successfully defended a test case for the business model of the defendant energy brokerage. The claim was discontinued. The claim alleged breaches of fiduciary, tortious, contractual and regulatory duties.
- DIT SA v Cameroon Quality Products Ltd and others: currently acting for the respondents to an arbitration appeal under sections 67, 68 and 29 of the 1996 Act.
- Ample Speed Ltd v Grain-Trans Ltd (British Virgin Islands, Commercial Division of the High Court): currently acting in a $1.8m debt claim in the British Virgin Islands.
- Clutch Consulting UK Ltd v DDI Holdings Ltd and others: currently acting for the claimant e-discovery provider in a QBD claim to recover unpaid fees and defend a breach of contract counterclaim.
- Gama Aviation (UK) Ltd v Taleveras Petroleum Trading DMCC (unrep., Commerical Court): partially resisted summary judgment in a dispute arising out an aircraft lease agreement.
- Donutterie Ltd v Loose Brands Ltd: acting for the claimant to recover unpaid sums under a supply and franchising agreement, and defend a breach of contract counterclaim.
- Corinna zu Sayn-Wittgenstein-Sayn v Casimir zu Sayn-Wittgenstein-Sayn (two claims, KBD): counsel for the claimant in claims to recover unpaid loans.
Shipping and international trade
- Palmali Shipping SA v Litasco SA: led by John Russell KC and Jessica Wells (previously led by Nathan Pillow KC) instructed by the claimant in a $2 billion contract of affreightment dispute.
- A v B v C v D (LMAA arbitration): acting for disponent owners in a five-day hearing arising from cargo contamination.
- A v B (non-contentious): led by Oli Caplin, advising on potential claims worth £345 million in relation to defective goods.
- A v B (LMAA arbitration): led by Michael Ashcroft KC defending alleged underperformance of an innovative vessel designed to support fish farming operations.
- A v B (ICC arbitration): led by Tim Young KC in a 2-week hearing concerning the catastrophic collapse of a vessel’s crane.
- A v B (LMAA arbitration): acting for the claimant in a dispute over damage to cargo during ocean passage.
- A v B v C (LMAA arbitration): Led by Tim Young KC acting for the respondent/counterclaimant in a dispute arising from the grounding of a bulk carrier in Russian waters.
- A series of FOSFA paper arbitrations relating to the destruction of a sunflower oil processing plant in Gaziantep, Turkey following the earthquake of February 2023.
Civil fraud
- Kings Security Systems Ltd v King [2021] EWHC 325 (Ch): led by Robert Howe KC and Christopher Newman acting for the defendant in a bribery action with a tortious abuse of process counterclaim.
- Pre-proceedings work on a £84 million civil fraud claim against two company directors, led by Blair Leahy (proceedings would have been in the Commercial Court in the British Virgin Islands).
- Assisting with expert advice for a foreign court in proceedings relating to an €86 million fraud. Advice dealing with breach of confidence, misuse of personal information, data protection law and the admissibility of covert recordings under English law.
Insurance
- Potter v Canada Square Operations Ltd (UK Supreme Court): Led by Charles Kimmins KC and Sean Snook acting for the respondent bank. Arguments relating to statutory construction, in particular, the distinction between deliberateness and recklessness.
- Tighe v Canada Square Operations Ltd (on appeal at Hull County Court): acting for the respondent bank on arguments relating to the legal requirements for a binding settlement in respect of claims under sections 140A-C of the Consumer Credit Act 1974.
- Advice on the scope of a professional indemnity insurance policy in a professional negligence dispute.
- Advice on various insurance disputes for two large property development groups, relating to damage to luxury residential developments in central/west London alleged to arise from construction defects.
- Thames Water Utilities Ltd v Eco Drill (England) Ltd v Natta Building Company Ltd: acting for the insurer of the Part 20 Defendant in a dispute about damage to a sewer.
Energy and Construction
- A v B (UNCITRAL arbitration): Acting for the respondent to claims exceeding £1 billion arising from coalbed methane extraction licenses.
- A v B (ICC arbitration): led by Wendy Miles KC and Angharad Parry in a Middle Eastern construction dispute comprising non-payment claims and design counterclaims.
- A v B (LCIA arbitration): acting for the claimant in a dispute over breaches of a drilling subcontract in an oil well project.
- Advice on the scope of obligations under a construction contract and whether the client is liable to carry out remedial works.
Jurisdiction, conflict of laws and injunctions
- A v B (LCIA arbitration): advice on the conflict between the illegality of a payment mechanism as a matter of local law in an African jurisdiction and the English governing law of the contract.
- CEX.IO Ltd v Winners Digital Ltd (unrep., Queen’s Bench Division): acting for the respondent resisting a disclosure application and de facto freezing injunction application.
- Eastern European Engineering Ltd v Vijay Construction (Pty) Ltd [2018] EWHC 1539 (Comm): as a pupil led by David Lewis KC resisting a worldwide freezing injunction.
- Sabbagh v Khoury [2018] EWHC 1330 (Comm): as a pupil assisting Philip Edey KC and Andrew Fulton resisting an anti-arbitration injunction.
