Hmmmm it maybe the fact he has things like a Hydraulic handbrake... there are several things that it may have that would make it NOT pass an MOT even though it could be more than safe on the road...

If it's a car built primarily for the track then i can to a degree understand why he's done it... if his mate has signed it and it's a PROPER ticket from a test station then it wont be illegal, cuz the car in theory can drive out of the test station and have sommat fall off and as long as it passed the test prior to that then it is still classed as being totally legal!!!

Look at cossy owners who weaken off the mixture to pass the emission and then as soon as they get home whack it back up... I myself actually had the MOT tester help me change the decat to a cat to pass the MOT then help me change it back when it had passed, he explained that by saying while he was testing the car he worked for the ministry, but while he was changing the Cat he worked for the company...

Not everything is black and white!!