Well....... bit of an update, after speaking to lots of people and coming to the conclusion that it would be very unlikely that the ECU would be faulty, I took it back to the main dealer and told them that it had been tested and was all ok and that it must be a wiring fault!!
So.... 2 days later I get a phone call saying that the fault is now cured and it was a wiring fault!!!!
I went to the dealer today to pick the car up, they charged me 2 hours labour so could not argue with that! I asked if I could speak to the technician which they allowed me to do and basically it turns out that when he plugged the ECU back in the fault disappeared!! so obviously it was a connection fault.
The car now starts straight up and fan works as it should etc, but.... it has a misfire on number 1 cylinder!!! so the engine light comes on and the car is really sluggish, the dealer basically said they was not sure what it was and I would have to pay for coils and plugs etc to test first so I decided I am going to try and investigate myself....!
So guys any ideas what this misfire could be?? I took the plugs out before when I had the compression test done (which all was ok) and they all looked ok??