I've read a bunch of horror stories about failing belts on these - from the history with the car it looks like the belt on mine's done a touch over 40k so I'd better swap it out soon!
Could any kind individual scan the relevant pages out of the haynes manual for me? I've got an Astra book, but it only covers the petrol engines.
I was also thinking of re-torquing the head bolts on it, as I read that a lot lose the head gasket around 150k - anyone know if they're stretch-type bolts and what torque they should be? Cheers!