In November 1954, Valentine was invited to sing at the Royal Command Performance, and in February 1955 he was top billed at the London Palladium. He also cracked jokes and impersonated entertainers, including Johnnie Ray, Frankie Laine, Mario Lanza and Billy Daniels. He recorded two number one hits, "Christmas Alphabet" and "Finger of Suspicion". His first chart-topper came only two months after his marriage to Elizabeth Flynn at Caxton Hall, which caused scenes of hysteria and was widely expected to sound the death knell to his career. In fact, 1955 was by far his best chart year, with two number ones and three other Top Ten hits.