How many movies have Frank Spencer and Godfrey Grayson collaborated on?

They have worked on 4 movies together! Their first movie together was Dick Barton Strikes Back (1949) while their highest rated movie together was The Adventures of P.C. 49: Investigating the Case of the Guardian Angel (1949). They have not worked together since Dick Barton at Bay (1950). They are most known for their crime films together.