I was going to add the possibility of it coming from radio's Round the Horne.
The only thing is that it refers to 'tonight' which makes sense with the Two Ronnies but I suspect RTH may have been a lunchtime show (not sure).
(
Mehitabel_Itrang,
Tue 22 Jul 2025, 8:20,
archived)
I think even knackers
would have been a bit beyond the pale for that era of The Light Program.
(
JustHere4Coffee remembers when all o' this were car parks,
Wed 23 Jul 2025, 0:41,
archived)