Jon Price notes brief background shots of RMs and RTs early in the film. A long chase scene culminates in former Bournemouth Corporation 14, a 1939 Leyland Titan TD5/MCW opentopper ending up in the harbour in this comedy actually shot in Teignmouth in Devon, called Tinmouth in the film.(thanks Bob Wingrove). Martin Ingle identifies the Titan as FEL214, hired from a dealer for the film.
Just before Wisdom boards FEL214 there is a brief rear shot of a maroon Devon General Leyland Atlantean; it can also be seen in several shots through the back window of the Titan. (thanks also Colin Read)