You could try here. Before getting my Ibiza I used to take my car to them whenever I needed a mechanic. Ken the owner is really down to earth and won't rip you off. If you give them a ring they should be able to give you a quote over the phone. About 5 years ago they did a belt change on my old diesel fiesta and it was about £130. Don't expct much in the way of a loan car though....