Thanks for your suggestions.
The thing is, the ECU has actually been tested and passed - the previous garage I was using (who I now have extreme doubts about) sent it off for testing and it passed. I subseqently took it to another garage when the first one closed down. They have gone over the whole car at great length and the only thing they can think it may be is the ECU. But as it had been tested they were dubious about shelling out the cash to try a new one on the off chance.
If I had thought to post on here while the car was still at the garage, the idea if checking it with another ECU would be appealing, but as I have now towed it home, and don't really have the skills to start swapping ECUs and so forth, so I think I'll just leave it as is.
And to be honest I have expended so much money and emotional energy on this car that I'm keen to get shot of it, even if it means getting substantially less for it than I could if I put some more effort and research into it.
So, has anyone got a rough idea what it may be worth in it's current condition?
Thanks again,
Kai