a while ago I passed by some information somewhere (here or elsewhere) about someone actually resilvering mirrors in the UK, and doing a good job of it.
I know of the Polaroid scavenging, but this sounded perfect ... but I can't find the information anymore.
I don't know about someone in the UK but I used marty1107 on ebay to get a replacement mirror for my Flexaret. I don't know if he re-silvers mirrors or just cuts down stock but he was able to supply me with a mirror to my specifications and it is bright and clear (and ridiculously inexpensive - $6.00 USD or close to it)
The guy in the US will be having a few mirrors coated at the same time which is very much cheaper than a one-off,. The UK company uses Aluminium which will last far longer than the old silvered mirrors.
Resurrecting this old thread to give Marty another thumbs up! Got an exact replacement for my Rolleicord IIb and it's.. well... exact! (and inexpensive $7 USD)