Thanks mate

Yes - sounds so simple when stated like that
Good point on checking power to ign and inj circuits

I do have full access to sensor readings live on the RP Lab software and also error codes stored. All sensors seems to be fine.

Good point checking if the ecu tries to compensate just before it dies - will try checking that in the editor software.

Thanks again a big help and it motivates to have some fresh ideas- will report back when I have had the chance to test these things (unfortunately I cant work on the car before sunday.)