[3] He rode for California during both the 1955 and 1956 seasons, improving his average significantly to 9.00 in 1956.
[4][5] In 1957, California switched its promotion to Aldershot Shots and Gilbertson recorded an even better average of 9.30.
[6] Gilbertson proved to be a leading rider, particularly in the Provincial League and added two more league titles in 1961 and 1962, helping Poole to succeed and gain the nickname 'The Flying Scotsman'.
He recorded 1,707 points in 196 matches for Poole and also won the Championship of Sussex in 1961.
[7] Gilbertson continued to ride for Poole until the end of the 1965 British League season but then retired.