I'm curious about the way that one broke down - hanging onto remnants of the last good frame is a very digital way of failure (it's the kind of thing I'd associate with a framesync losing its input). So far so straightforward, but it seems quite advanced for 1992. Any guesses as to what might have failed?
Back in 1992 there would have been analogue microwaves links from the Crucible, via a midpoint at Wincobank, and then into one of the mast head receivers - probably Holme Moss?
Then PAL vision circuits to Manchester CTA, and then to London via Birmingham.
The most likely point to fail (although this is a complete guess) is the midpoint on the isolated Wincobank site.
Running on a small genny, backed up with batteries (which didn't always have the capacity you'd hope for), it may well have been the issue.
However, that would have put receiver noise (from HM) down the line.
If it was into a frame sync at TVC would it reject that - and leave the last frame on its output - it's not exactly a clean frame?
The days of Natlock were long gone by 1992, so some syncroniser would be across the line.