Martyn specialises in commercial contracts, recovery of assets including freezing orders, constructive and resulting trusts, enforcement of foreign judgments. His practice is widespread in these fields and he has experience of the legal systems of foreign jurisdictions including the United States, Switzerland and of the EU acquis communautaire. Recent matters include instructions from an applicant in a substantial claim involving the registration of a judgment from the Tanzanian High Court in the Queen's Bench Division, giving evidence on UK company law in the Slovenian Insolvency Appeal Court and on the doctrine of forum non conveniens in English law before the United States Southern District Court of New York State.
Other areas of work include professional negligence and regulatory work, including barristers, solicitors and accountants especially in those areas reflecting his expertise. He currently instructed in four substantial professional negligence cases.
Martyn has written several books including "International Contracts" published by Barry Rose 2004.
Martyn welcomes direct access clients.
Martyn recently successfully represented a client who sued a barrister for negligence. He appeared for the Claimant in action against HMRC. He has also represented an international stamp dealer in an AAA arbitration and defended a claim by foreign government involving proof stamps and the ownership of printer's waste. He was instructed by the applicant in the Commercial Court in a CPR Part 11 application involving a French citizen domiciled in the Bahamas sued in London. He is currently instructed in defending claims for over £11.5 million in the Queen's Bench Division and connected directors disqualification proceedings.
He has been instructed by the applicant in an application to European Court of Human Rights against the UK government involving delays at Central London County Court. He recently obtained judgment for a Mayfair antique silver dealer. He represented the applicant in an appeal from a decision of the Health Professional Council (Subner v Health Professional Council  EWHC 2815 (Admin)) in which the issue is whether the provision in Practice Direction Part 52 restricting health worker appeals to a review and not a re-hearing is ultra vires - the case is currently before the European Court of Human Rights.
He recently appeared for the claimants in a cyber squatting case where an estate agent's web site was attacked by bogus and pornographic links by a rival firm and obtained a permanent injunction and damages: see Eddison White v Luke Bennett widely reported in the press.
Martyn lives in London and is the trustee of two charities. He is an amateur archaeologist and has been elected a Fellow of the Royal Asiatic Society.