A regular performer on folk circuits, in 1981 he reached number 3 in the UK singles chart with "The Sheffield Grinder" / "Capstick Comes Home". As a comedian he had an eight-part television series, Capstick's Capers, on Channel 4 in 1983.
Capstick was also a prolific bit-part actor, with a career including minor roles in the soap operas Emmerdale and Coronation Street. In the latter he played the recurring character of the brewer Harvey Nuttall.
His career at Radio Sheffield came to an end in January 2003, when he was dismissed for an alleged drop in quality, following the latest in a string of drunk driving offences. He continued to write a regular column in a local weekly newspaper, the Rotherham Advertiser, but his mood and health never recovered from the sacking.
He was found dead at his cottage in Hoober, near Wentworth, Rotherham.
He was survived by wife Gillian, son James and daughter Vicky.
Capstick was author, with Paul Donoghue, of a book on the Appleby Horse Fair.