I recently found a tape with a Scottish Television ident that I'd never seen before. Basically it starts with a shot of a castle with bagpipes playing, before fading into the Thistle logo with a back background.
On the same tape theres a few Channel 4 idents for an Animation Day. Using footage of Wallace and Gromit's A Grand Day Out and War Story with the C4 logo added. Theres a short Scotland Today bulletin in there too.
Another old tape has some complete Stay Tooned episodes, and also has the first airing of the Simpsons ep where Homer grows hair and becomes an exec.
Another tape has a BBC1 Scotland COW closedown with menu.
At the end of a family homevideo from like....1988, theres the end of a Postman Pat episode with a short musical break w/caption before leading into the TWO logo w/countdown.
Theres also a 1989 tape with some clips of kids shows on it, mostly Glen Michaels' Cavalcade and Ghost Train stuff. Has an episode of Rainbow on it too where Sooty makes a cameo. Also features an early You've Been Framed episode. Also has a DEFII promo leading into the TWO ident.
I'm pretty sure theres also a BBC1 closedown on one of the tapes featuring a portrait of the Queen instead of an ident. Also features TCF.
Another tape has a few things taped from The Children's Channel. Theres also a tape with mostly Cartoon Network from around 1997. At the end of that tape, theres the infamous incident in the Hungarian Grand Prix where Damon Hill, in the crap Arrows car, took the lead whilst ITV were showing adverts.
Another tape has a recording of Take Your Pick from around 1991, with a late-night Blondie movie season also featuring. (Complete with ad breaks) There was also a late night ITN news bulletin on the tape, but someone taped over it.
I had another tape with alot of CBBC stuff circa 1990, but I've misplaced it.
More recently, I have some tapes with clips of BBC2 Ceefax breaks and the occasional clock.
Most of the tapes are showing their age however, so I rarely watch them incase it does any damage.