Toe Knee: It's quite hard to tell, as I don't really drive it so it only runs for maybe 1/2 hour at a time. If it does, it's not a lot although it is certainly dripping out of the exhaust. I topped it up this evening and will double-check in the morning.

Forgot to say: I also had a couple of garages look at it. One said that it was the head gasket (apparently they did a coolant gas test, which came out positive), another said that they didn't think it was that (which is backed up by my conpression test I think) and suggested cam timing (eh?!) and the third (supposedly an automotive electrician) said they couldn't read the ECU but that it was probably a sensor causing over-fuelling.

And you wonder why I'm confused?!

I appreciate anything you can come up with!