Patrick Turner wrote

I doubt Sowter could do the 2 OPTs and PT and a choke for less
than the 400
quid.

About 550 at least.

http://www.sowter.co.uk/

same price/quality as anywhere else in Western Europe or North
America. For small quantities I have not heard of better value
Chinese sources. They would probably need to import the steel, if
not the laminations, because they are unlikely to have access to the
best steel technology in China. Winding transformers may be monkey
work, but making state-of-the-art steel laminations isn't.

cheers, Ian.