Well, finally bit the bullet and made my mind up on what to do next. With the diesel miggy dead and unlikely to come back to life (but I'll never say never till it's off my drive) and needing a new car I came to the difficult decision of what to replace it with. I spent hours looking at VW's, old Merc's, old Jag's, Mondeos, refused to touch anything french, and came to the conclusion that there was only one possible replacement for an Omega.... another Omega

Got a '99 2.5 with 65,000 on the clock. Only a CDX, so will be looking to get some of the Elite gear across to the new motor.
Just out of interest - how complicated would it be to transfer:
Auto-Dipping mirror
Memory Seats
Bose/Head-Unit/Changer
Rear Blind/Shelf/Speakers
Xenon's and associated sensors/washers
And I've got a wierd little button on the dash that I didn't have in the old one next to the headlight switch which has a sort of T and 'm' I think, with a little LED on it. Haven't pressed it yet - no idea what it does
