Thanks mate, exactly the plan for tomorrow. While my father was a fitter and turner (and reconditioned engines for a living!) I don't have a mechanical bone in my body. Didn't take after him at all, and he took all that knowledge to the grave with him over a decade ago!

I know I'm lucky got the check engine light - without it, troubleshooting would be very, very time consuming.

I'll fill you in on what happens as it happens - I've got a very busy week, but lucky, I work from home, and the bus network near my house is pretty dang good. Its my first ever check engine light!