Sir Peregrine joined what is now Brick Court Chambers in 1974, having read law at Cambridge University and been called to the Bar in the Middle Temple. He practised in commercial law, including shipping, insurance and re-insurance, banking, international trade and arbitration. He was appointed Queen’s Counsel in 1991 and continued to practise in these fields, appearing in the High Court (particularly the Commercial Court), Court of Appeal and House of Lords, as well as both domestic and international arbitrations (including in France, Switzerland and the United States).
He was a judge of the Commercial and Admiralty Courts from 2002-15. As well as hearing and giving judgments in a broad range of commercial cases in that court, he sat in the Chancery Division, Companies Court and Upper Tribunal (Tax and Chancery Chamber). He was also a Presiding Judge, with administrative responsibilities, of the North Eastern Circuit. Between 2015-20 he was a judge of the Court of Appeal, sitting in a wide range of cases, giving judgments in civil law cases, including commercial and public law cases. He also conducted criminal trials and appeals between 2002 and 2020.