Royal Mail is marking April Fool’s Day by issuing a set of stamps featuring some of the nation’s most popular, and funniest, comedians.Photographs of the Two Ronnies, Norman Wisdom,Billy Conolly, Victoria Wood and Spike Milligan are among those on the 10 first class stamps, which focus on performers from the tradition of standup and sketch shows dating from the 1940s to the present. The other comedians featured are Morcambe and Wise , Lenny Henry, Peter Cook and Dudley Moore, French and Saunders and Monty Python.