i pulled over and fell asleep in a bustop after a horrificly long day at about 2am on the way home from work. the car had ran out of mot two days prior and had not been able to pass emissions due to electrical issues but i HAD to use the car to get to work. the police stopped, ran my info, realised i had no mot and woke me, i explained the situation to them and they simply told me to not drive it again unless it was to an mot station. they didnt really seem to car that much at all as the car was in a 1/2 decent state of repair (R reg escort).
based on my experience and how not-bothered the old bill seemed with me, i cant see your bro having to much grief considering the circumstances.