Although McGregor made his name developing tax planning trusts in the Cayman Islands, helping clients avoid punitive UK tax provisions, he also published a seminal work on UK personal injury law, served as president of the Harvard Law Association for twenty years, was Warden of New College Oxford for more than a decade, regularly shared his love of music with others by performing the work of Noel Coward and Cole Porter at private parties, and he was appointed CBE in 2014 for his services to law and education.
But it is perhaps for his wealth management work in the Cayman Islands that McGregor will best be remembered. Today the British Overseas Territory generates $1.2 billion of its GDP through the financial services industry while it is also rated by HSBC as the friendliest destination in the world for expats. Indeed, it is the only place in the world with more registered companies than inhabitants.
British expats in Spain, France, and Italy are behind a legal challenge submitted to the High Court in London calling on the result of the 2016 referendum to be invalidated.