Just to add another price/job done, I got this done when I got my 2005 2.8CRD earlier this year and actually got it done at a Halfords Autocentre (before you groan, Halfords Autocentres are separately run to their bulb fitting empire!) as it's just beside work. It's a pig of a job, so took them the majority of the day, but for belt and water pump it came to around £500 including parts.