How many movies have John Nathan-Turner and Roger Limb collaborated on?

They have worked on 7 movies together! Their first movie together was Doctor Who: The Keeper of Traken (1981) while their highest rated movie together was Doctor Who: The Caves of Androzani (1984). They have not worked together since Doctor Who: Revelation of the Daleks (1985). They are most known for their science fiction films together.