Heartbeat (1992) - Season 13 Episode 23 -

Merton and his team set out to find the saboteur behind a series of rigged accidents in the lead-up to the Aidensfield Hill Climb, an annual race for motor cars. Meanwhile, Liz Merrick grows concerned about a man sleeping rough who she suspects may be suffering from asbestos poisoning, and Vernon finds - then loses - a fortune.