Born in Leigh-on-Sea, Essex, England on July 23, 1912, Wilding became a commercial artist after leaving school. He gained employment in the art department of a film studio in London in 1933, and he was soon approached by producers to become a movie star-in-training due to his dashing good looks. After debuting at age 21 in Bitter Sweet (1933), Wilding worked steadily in British pictures for nearly three decades. Though never a star of the first rank, he had leading roles in numerous films, including a part in the classic Het schip waarop wij vochten (1942). Wilding often co-starred with Anna Neagle.
Wilding moved to Hollywood and was featured in two of Alfred Hitchcock's lesser efforts, Under Capricorn (1949) and Stage Fright (1950).
Wilding's last movie role was a non-speaking cameo in Robert Bolt's Lady Caroline Lamb (1972), which co-starred Leighton.