 In August 1969, he left Bee Gees and he was replaced by Pentangle drummer Terry Cox to record the songs for their 1970 album "Cucumber Castle".Frederick Colin Petersen began his acting career at the age of seven.When he was still nine years old in late 1955, he starred in the film "Smiley" (released in 1956), with Ralph Richardson, but by the time he was twelve in 1958 he was forced to cease acting as his mother felt it was interfering with his education.