Dewes was a protegé of E. J. H. Nash, the British Evangelical Anglican clergyman. In 1945, he was one of three relative unknowns from public schools included in the England side for the third Victory Test against Australia at Lord's. The others were Donald Carr from Repton School and the Etonian, Luke White. Dewes had left Aldenham School the previous year. In the event, the three contributed little, and did not figure again in the other Victory matches. Dewes did National Service in the Royal Navy, then went up to St John's College, Cambridge, in 1947. At Cambridge he won Blues for both cricket and hockey. His cricket Test debut came against Donald Bradman's formidable side in 1948, when he struggled to make runs against the opening attack of Ray Lindwall and Keith Miller. The next season, he shared a record unbeaten stand of 429 with Hubert Doggart for Cambridge against Essex and, in 1950, added 343 for the first wicket with David Sheppard in the Cambridge total of 594-4 declared against the touring West Indians. The 1950 season was Dewes' peak, and he scored 2,432 runs in the full season at an average of 59.31, with nine centuries. He played two Test matches against the West Indies that summer and, in the first of them, made 67 in an unsuccessful rearguard action against the spin of Sonny Ramadhin and Alf Valentine. He was also picked for the tour to Australia of 1950-51 and played two Tests there. But in all Tests he reached double figures on just three occasions, and only once passed 50. After this tour, he became a teacher and was never able to play more than a few matches each season, although as late as 1955 he made 644 runs in seven matches. His final first-class match was in 1957. He was a master at Tonbridge School and Rugby School and was headmaster of Barker College, Sydney, from 1958 to 1963. He then returned to England as a housemaster and head of careers at Dulwich College until his retirement in 1987. Among his pupils was Nigel Farage who paid tribute in his autobiography to the advice he received. His son, Anthony, played first-class cricket as a batsman for Cambridge University in 1978 and 1979. Dewes died on 12 May 2015 at the age of 88.
