 He left Torquay in November 1950 to sign for Cardiff City and he became a virtual ever-present in the Cardiff line-up for the next five years, and was one of the clubs most popular players during the 1950s before moving to Arsenal in 1955 along with Gordon Nutt in exchange for Brian Walsh.Tiddy made his debut against Sunderland on 24 September 1955 but most of his time in London was spent in the treatment room as he suffered from numerous injuries, which forced him to undergo a cartilage operation.By the time he was fully fit, in 1957-58, he had to share the left wing position with Joe Haverty and Gordon Nutt, only playing 12 matches.