BBC2 Closedown 

In the 1970s BBC2 always seemed to have a marked disinclination to close down. Poems, announcements, musical compilations and on occasion what appeared to be the holiday snaps of the presentation people all delayed the moment of departure. This is a typical example - curiously unsettling if not downright depressing. The slides feel more like something that would lead in to Play School.
UPDATE: The mobile featured in the slides was made by home toy maker Maureen Roffey, who featured in the BBC series "Making Toys". There's a feature about her in the 04/10/1975 edition of Radio Times.