Name the famous person

there was a gentleman at west lakes friday night with jumping Jack, going by the name of Hancock!!!!!!!!
leading junior driver, from plympton said "who's this Hancock bloke with JB", i said see that picture of Our Sir Vancelot on the wall, and the bloke with it, the driver?? it must be his twin brother!!!!!!!!!!!!!!!!!
leading junior driver, from plympton said "who's this Hancock bloke with JB", i said see that picture of Our Sir Vancelot on the wall, and the bloke with it, the driver?? it must be his twin brother!!!!!!!!!!!!!!!!!