From school he became an apprentice engineer before then joining the Monmouthshire Constabulary as a police officer.
[3] He joined the British Army in 1943, remaining in the Forces until 1946, holding the rank of major on demobilisation.
Peacock scored a try on his debut and was selected to play in the next two games of the Championship under the captaincy of Guy Morgan.
During the game against Ireland, Peacock scored a joint try with Swansea's Howie Jones; both men dived for the ball and the referee could not decide on the actual scorer.
The final game of the tournament was against France and Wales won an overly violent match to finish the Championship in second place behind England.