Chris, I think a TV12 would be a very poor choice as a first valve restoration project. I'm quite familiar with valve equipment and I'd be reluctant to work on one. TV restoration is a specialist area, and I think you'll find most of the TV people on this forum have some sort of background in commercial TV repair.
Your advice about recapping, reforming electrolytics etc. is fair enough as far as it goes, but I get the impression that shaft is freely admitting he's some way away from this level of electronic competence.
Shaft, if you want to get into restoring this set yourself my advice would be to start with a simple radio from eBay or wherever, then maybe progress to a 60s dual standard set, then go back to the TV12 - take it one step at a time. It's your telly though
Best regards, Paul