How many movies have John Cleese and Philip Cowlam collaborated on?

They have worked on 1 movie together! Their first movie together was Monty Python and the Holy Grail (1975) and was their highest rated movie together. They have not worked together since Monty Python and the Holy Grail (1975).

Role
Second Swallow-Savvy Guard / The Black Knight / Peasant 3 / Sir Launcelot the Brave / Taunting French Guard / Tim the Enchanter
Crew
Assistant Art Director
Crew
Writer