Regarding Vauxhall dealers, I'd shop around if you can. Last December I had the belt changed on my T reg Astra (only 8 valve - whether that makes any difference I don't know.) Prices including fitting ranged from £75.00 to £95.00 from dealers in the North East.
My local Nationwide Autocentre quoted £90.00 at the time, saying that they'd have to order the parts from Vauxhall.
Worth bearing in mind.
Steven
I think the belt was a "Contitech" but if plastic rollers are no good then its a no-go anyhow.
Ive found the kit on autovaux
AVEC177 Timing Belt Kit £74.95 (plus VAT and delivery) Will mail them for details on the rollers.
Seems about right as there is one on ebay from a supposed vauxhall dealership.
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Vauxhall Derby want £97.88 inc vat but were unable to tell me if the kit had metal or plastic rollers.
Apart from obvious leaks from waterpump is it just a case of checking that it feels smooth and free?