Id ageen with above comment.
At 4 years, it be due its annual service, if its on t&d, which would be its main service, which would be fuel filter, pollen filter, maybes air filter?. It would also yes, be due tis cambelt&tensioner repalced. Water pump is advised, as its within the same area, but is down to customer if they want this doing. Brake fluid change is advised evey 2 years, so if you last had it done in 2007, then yeah thats due.
Service cost would be around £280-£310 (rough estimate)
Cambelt, tensioner and water pump would be around £450
Brake fluid change £46.88
A/C service £79.99
DSG oil and filter change, im not entiley sure, i wouldnt even like to guestimate..
all these prices are at our labour rate of £79.95 a hour, thats including VAT.