How many movies have Brewster Mason and Ronald Wilson collaborated on?

They have worked on 2 movies together! Their first movie together was The Dam Busters (1955) and was their highest rated movie together. They have not worked together since True Patriot (1977).

Role
Flt / Lt. R. D. Trevor-Roper, D.F.C., D.F.M.
Role
Flight Lieutenant D. J. Shannon, D.S.O., D.F.C.