Re: 147 JTD cambelt!!!
A lot closer, but not quite so keen on price as Jamie Porter (though still a whole load less than a main dealer) is Intaservices in Leicester who repeatedly get good write ups from their customers on this forum and the AROC forum
Speak to Don Simpson on 0116 251 0899.
As to doing it yourself, well we can't judge your level of experience really, but its an expensive hit if you get the belt tension wrong on an Alfa. It can't be that difficult a job, but its one of those 'must be got right first time' jobs I leave to the experts these days.