Gourmet Night (a.k.a. Gourmet's Paradise) - S1-E5
Continuity mistake: When Basil goes to fetch the branch to give the car a thrashing after it breaks down, the car manages to move onto the pavement all by itself.
Gourmet Night (a.k.a. Gourmet's Paradise) - S1-E5
Continuity mistake: When Basil is driving home the second time, he is turning into a street where a van is parked. When he turns the street is dry. In the next scene where he is backing away from the van, the street is all wet.
Visible crew/equipment: When the Hamiltons arrive, Mrs Hamilton says 'May I introduce my husband.' The boom mic is seen at the top of the screen.
Visible crew/equipment: When Basil's trying to persuade Sybil about the woman in the guest's room, the shadow of a boom mic appears on the top wall.
Answer: It's "Leisure Complex" by Dave Gold and Gordon Rees. Can be found on YouTube. The relevant clip is around 25 seconds in.