In October 1981 as the UK clocks went back on BBC1 Richard Straker realises with horror that the effect of fading from a clock on the Noddy rack to one on the wall won't work as he's got them the wrong way around AND in vision he's got the one on the Noddy rack. This then means a fade to black as Noddy moves to the globe (about 5 seconds). I've repeated it with a clip of Noddy going through the motions. BBC2 was okay as they transmitted late anyway.
On 28th March 1982 Roger Maude had better luck as the clock was now electronic. Unfortunately having made it to the National Anthem disaster strikes. Over on BBC 2 Peter Bolgar has no headaches
All is electronic by 1985.