The Hammer movie version of Quatermass and the Pit was released in the mid 1960s and was one of Hammer's best movies. But the original script was broadcast live on the BBC in the 1950s in six 30 minute episodes (and we are very lucky anybody recorded it: the first two series of Quatermass did not survive in their entirety).
My question is: what are the key differences between the 3hr TV version and the much shorter Hammer movie.