UKPassats

My cambelt snapped yesterday and I'm currently considering my options. I don't imagine there's a possibility of having escaped with no damage because it was at about 2000 revs at the time.
To start with can anyone advise the best way to source a recon engine and/or can anyone recommend a reliable mechanic/company who could rebuild the current engine (ideally Cambridgeshire but happy to go further afield)?
All suggestions will be greatly appreciated.
Richard