Can anyone recommend someone in the UK who is expert in servicing and overhauling vintage cassette decks?

I have a lovely old Sony TC-229SD (circa 1977) in near mint cosmetic condition which sadly will not play (although FF and Rew work fine) and also a Sony TC-K81 (circa 1981) which has some tape transport issues. Both of these machines are excellent when fully working to spec. I have another TC-K81 which is fully working and is really superb (even better than a Nakamichi Cassette Deck 1 I once owned).

Regards,

Gordon.