Just done the cambelt and water pump on mine, admittedly early at 45k but its 5 years old, mines a Cupra 1.8t. The part numbers are genuine VW/Seat parts.
Cost me £75 and a morning to do mine.
(all VW part numbers + retail prices, (VW part numbers due to working in a VW
dealership), part numbers for belt, tensioner + water pump are same as SEAT as checked before fitting mine)
Cambelt kit (cambelt, tensioner and idler roller) 06A 198 119B @ £75.00 Exc vat
Water Pump metal blades (exchange) 06A 121 012X @ £25.80 Exc vat
So its £100.80 exc vat just short of £120 for parts. (or £75 if u get trade prices at VW)
Then add 2 hours or so labour totalling around £150 (
dealer prices)
Making a grand total of £270 ish at
dealer prices with genuine parts.
Hope this helps people.