Hi Lindzy, sorry can't help with Peterborough as I'm in Cheshire, and the only other I know is in Birmingham AKA Motormech that Nello uses. Or maybe a bit nearer is Autolusso in Dunstable? http://www.autolusso.co.uk/services.html They are highly regarded in the Alfa world and are roughly an hour from you. As Andrew says as the water pump is driven by the belt it only makes sense to change it at the same time as they already have the car stripped down. It's only and extra two bolts to undo and the cost of the pump is fairly cheap.