[1999 Vauxhall Omega 2.0]

Yes the starter inhibitor switch, which, IIRC, is on the top of the box, would be a good place to commence, but I guess as the OP is now 6 months old, things have moved on.

[The infamous zaphod checking in.]

Greetings from Bristol!

A Saab man for many years, and of course the modern ones have major GM influences, including the 9-3SS Aero in our fleet, but I digress.

Owned two Mk2 Cavaliers in my youth - a 1.6GL, and soon after, when the opportunity came up, top of the range 1.8 CDi.

Both were excellent for what they were, and I remember them fondly..

Good luck with the new forum.