Try Nigel at Angel Tuning. They are fantastic. Just did my Cambelt, waterpump, Variator and full service for under £500. (2.0TS 156)
They mainly work on Alfa and is highly recomended. I did a 320mls round trip to use them and would do so next time too..
Don't be frighened by them being a "tuning" compnay, they are Alfa SPecialists and excetionally helpful.
Angel Tuning Ltd
3 Church Terrace
Harbury
Leamington Spa
Warwickshire
CV33 9HL
087 091 091 16
http://www.angeltuning.co.uk/