//I remember watching Quatermass from behind the settee. //
Amazing. That series was the only thing that scared me as a child and,like you, I watched it behind the settee pretending to my mum I was asleep whilst she was knitting and knew damn well I was watching it.
As soon as it finished she would say,"Right young man it's way past your bedtime up those stairs with you."
I used to go into my older sisters bed and wait for her to come home from Judo lessons. I was literally in a cold sweat but never missed an episode of Quatermass and the Pit. I can visualise it now. I was about 8 at the time.