[4] He and Wally Green formed a partnership at Eastbourne that became known as the 'Terrible Twins' due to the fact that nobody could beat the pair in a heat.
[2] Despite winning the league with Eastbourne, he moved on and would ride for the Hastings Saxons from 1948 to 1949, recording averages of 9.75 and 9.06 respectively.
[6] After three years with Leicester he started the 1953 season with the New Cross Rangers but the club folded in June.
He was forced to find new club and switched to Belle Vue Aces, finishing with a disappointing 3.87 average.
[7] Grierson retired from speedway in 1953 but agreed to ride some matches for Leicester in 1954 as injury cover.