Hi guys, cheers for that, yeah unfortunately it's going. I've had 2 other people contact me directly, they've had failures very similar, so I'm starting to think the VM Motori 2.8CRD's might have a bit of a flaw in them. That'd explain why others have had a lot more out of theirs with the Petrol or different engines. No more GV's for me for a while, going to a Zafira (I know!) as need low mileage and something cheap to run/fix, not nearly as interesting as my old GV though. Sorry @@BumBle02 I've not been back to my parents yet where the GV is sat looking miserable on the drive, when I do I'll get you the o-ring sizes for pickup, there were definitely two O-rings on it though, one just visible when installed, the other inside the fitting.