Episode: 5:6: October the Thirty Second
Rooting through some old tapes I discovered the opening credits to this 1985 episode feature a London Transport AEC Regent III RT passing the Houses of Parliament. The episode also guest stars Elvira and Doug McClure, also British actor Tony Steedman, who succeeded Peter Vaughan as Shirley's father in the BBC sitcom Citizen Smith. You couldn't make it up.