BBC Anthology series
–Year in film: 1979
–Who in bedroom: Stu ~10, Davey ~8
–Kind of beds: 2 in 1
–Available on DVD: no
–I own: no
–Comment: There are two brothers (Peter and Paul Moran, brothers in real life) and their friend Dingo (Tommy White) who watch horror movies at night (I think together in a different room). Probably the brothers later sharing one wooden bed (maybe two mattresses and sheets ?). 50 minutes. Scene at 6 minutes. Another bedroom scene at the end. S9e11.
I found this by coincidence on YouTube searching for some different British School TV series.
Quite funny movie, but there are much better ones. Davey is the younger brother but I think is older than he looks like her.