He played little tournament golf and was primarily a club professional in Sweden, where he lived for more than 60 years.

[1] He was then briefly an assistant at Newmarket Golf Club before taking up a position in Sweden in 1962.

[1][2] In 1967 and 1968, Cockin was sponsored by a Swedish businessman to play on the British and European circuit.

In the 1967 Penfold event, Cockin was tied with Australian Stan Peach after the 72 holes.

He had led after two rounds but finished in a tie with Ángel Gallardo from Spain and Australian Bob Shaw.