A comedy movie released in 1980, Rising Damp is an extension of the television series that ran from 1974-1978.
It revolves around Leonard Rossiter’s character, Rigsby, and his large townhouse, where he rents rooms.
Miss Jones (Frances de la Tour) and Philip (Don Warrington) are in the movie but Richard Beckinsale (Alan) had passed away the previous year.
Christopher Strauli (John) was written in to the script and apart from that, it was pretty much the same ongoing story as before, so business as usual.
Movie pages here.