Update
He popped around mine Monday to have a look, I removed the airfilter and took it for a quick blast and all seemed to be fine, replaced the airfilter with a spare one I had and again all appeared ok.
We removed the Bluefin and it went into Ford yesterday, they had it for 9 hours and found nothing but have told him they have updated it to the latest technolgy?
Anyway he's going to see how it runs then reinstall the Bluefin. When he bought the car off me Bluefin was already installed, he wanted me to remove it but I convinced him to leave it on and now that he has had a couple of days without it he's desperate to get it back on the car.
Although not a lot has been done, fingers crossed it wont happen again
Thanks for your help guys
Cheers