The Terrornauts (1967)

Really strange British science fiction. Dr Joe Burke (Simon Oates) is convinced there are intelligence creatures out in space and is searching for them fruitlessly at a radio observatory with the help of Ben (Stanley Meadows) and Sandy (Zena Marshall).

When they finally make contact with aliens in the asteroid belt they are kidnapped along with accountant Mr Yellowlees (Charles Hawtrey) and the tea lady Mrs Jones (Patricia Hayes). Yes Charles Hawtrey in a science fiction film, its a sign the film doesn't really take itself very seriously.

So it is all rather Dr Who in look and the level of special effects. It has an interesting science-fiction plot, especially for it's day. The reason for the alien kidnap in fact turns out to be for the good of mankind...