According to IMDb the song was written by Eric Clapton / Ian La Frenais (1984) George wrote two songs for the film Celebration and Focus Of Attention both from (1984)
Don't know either of thses songs , the DVD of this comedy film is avalible from Amazon .
It's a long time since i've seen this film but i think it was quite a fun movie , it's got Michael Caine and Leonard Rossiter in it which good casting as well as Billy Conolly , might be worth getting the DVD ?
George's Handmade Films produced it , looks like he was quite involved in this film more so than his others