You'd be interested in this book
(Insane price) on the history of
UK radio and TV manufacturing
up to 1990.It has a lot of technical
information,including the Thorn(EMI)
fully transistorised 25" colour TV from
1967.(Thorn 2000 chassis).
https://www.amazon.com/Setmakers-His...y&sr=8-1-spell
It was listed recently on Amazon UK
at a "normal" price.
https://www.amazon.co.uk/Setmakers-H...y&sr=8-1-spell