In the 1919 season, he made his then highest score, 92, in the match against Gloucestershire at Taunton while batting under an alias: Rippon was working for the Inland Revenue and had not been given permission to play in the match. So he batted as "S. Trimnell", using his grandmother's name. By the time the 1920 edition of Wisden was published, the story had come out and the innings is recorded under Rippon's real name: "A. E. S. Rippon, who played under an assumed name, enjoyed by far his biggest success during the season," Wisden wrote. In six out of the ten seasons between 1920 and 1929, he made centuries, but never more than one in any season, and his total of runs in a season never exceeded 600. Among his centuries was one of 118, made in Somerset's first-ever first-class match against Glamorgan in 1921. He put on 189 for the first wicket with the dashing Peter Randall Johnson, who made 123 of the runs; Rippon was, by implication in Wisden's report, much slower, though his runs came in 190 minutes. His highest innings was 133 against Worcestershire at the Knowle ground in 1927, the runs being made out of 314 runs while he was at the wicket: he "wore down the attack", wrote Wisden, and "showed such patience in waiting for the right ball to hit that he did not give a chance". Not all of his batting was slow, however: in 1928, the last of his centuries was 112 against Hampshire and he put on 197 for the first wicket with Tom Young, the runs coming in less than 150 minutes. Rippon's return to the Somerset side after an absence of eight years in 1937 was less successful, and his top score in 12 innings was just 28. Sydney Rippon was the father of the UK Conservative Party politician Geoffrey Rippon, who was a minister in the government of Edward Heath.