Self-contained from the late '70s/early '80s, possibly part of the BBC's Schools and Colleges programming.
A group of four(?) children is engaged in a battle-of-wits with two disembodied heads communicating with them via a television. Outwitted, the two heads (one male, one female?) agree to releasing the children from the room they've been trapped in --
-- Except there's a twist-ending. Buggered if I can remember what but I think it implied the kids were trapped unwittingly in the same, never-ending battle of wits.
I caught a lunchtime repeat of it a few years after I first saw it and seem to remember one if not both heads were played by faces familiar from . . . uh, something else.
A group of four(?) children is engaged in a battle-of-wits with two disembodied heads communicating with them via a television. Outwitted, the two heads (one male, one female?) agree to releasing the children from the room they've been trapped in --
-- Except there's a twist-ending. Buggered if I can remember what but I think it implied the kids were trapped unwittingly in the same, never-ending battle of wits.
I caught a lunchtime repeat of it a few years after I first saw it and seem to remember one if not both heads were played by faces familiar from . . . uh, something else.