Bobby Ball appeared as John Wilson in a single episode 'Cliffhanger' (series 3 episode 8) which was first shown on 4th January 2004.
Like his appearances in Heartbeat, he plays a character in a light-hearted storyline that runs alongside the more serious plot. In this case Mr Wilson has been in the hospital to have an ingrowing toenail removed. It is cup final day and he wants to watch the match with some friends, so gets Head Porter Ken Hopkirk to try and arrange a TV and somewhere to watch.
In the main story fossil collectors are hurt in a landslide, while an armed man holes up in the operating theatre.