This film also screens on 8 & 12 December and is part of the BFI sci-fi season. Details here.
Time Out review:
'The third and most interesting of Nigel Kneale's Quatermass parables, scripted without interference by Kneale himself from his original TV series, so that his richly allusive web of occult, anthropological, religious and extraterrestrial speculation emerges intact as excavations at a London underground station turn up what appears to be an unexploded Nazi bomb, but proves to be a mysterious space craft.'
Here is the trailer.