Quatermass Experiment 1
Quatermass Experiment 2
Quatermass In the Piit
The ITV Series in the late 70's

I never saw the original BBC series, but have seen all the above and Quatermass 2 takes some beating.

Quatermass in the Pitt was the first Horror Film I was allowed to watch, it was screened on Christams Day at 11+pm . Awesome. Eiher in 76, 77 or 78 I cannot quite remember.

I also remember watching Robinson Crusoe On Mars on christmas day in 1967, 68 or 69.