 He practised as a barrister in chambers in London and was also the principal author of "The Law of Estoppel".Lancelot's eldest son, Cyril Feilding Everest, enlisted in the Canadian Infantry on 17 November 1914 and was killed in action on 9 October 1916 at the Battle of the Somme.Nick Knowles, the UK television presenter and musician, is the great great great nephew of Everest on his mother’s side.