Got my caps in yesterday and have been working on the radio section.
Looks like it's been rewired for a 5Y4 when the schematic calls for a 5Y3.. Interesting given the 5Y3 seems to be more common.
Recap on radio part is complete, am going to try a careful powerup later today after double-checking I've got the 'lytics in the right way round... Power transformer is good, kicks out ~600VAC (center tapped 300V, this is leg to leg), 5VAC and 6.3VAC with the rectifier pulled, all tubes light up. Will need to source a replacement dial lamp at some point though...
If it cools down a bit I may start recapping the TV chassis... right now it's blistering hot and I don't fancy slaving over a soldering iron to boot.