 He also won caps for Great Britain in 1954 against Australia (3 matches).Silcock played right-, i.e.number 10, in St. Helens' 13-2 victory over Halifax in the 1956 Challenge Cup Final during the 1955–56 season at Wembley Stadium, London on Saturday 28 April 1956, in front of a crowd of 79,341, and played right- in the 3-10 defeat by Oldham in the 1956–57 Lancashire County Cup Final during the 1956–57 season at Central Park, Wigan on Saturday 20 October 1956, in front of a crowd of 39,544.