thanks for your comments , turns out it was two trivial things, side light bulb and windscreen wipers, mot station was round the corner from Halfords, so risked it and drove round and got the parts. all sorted.
don't go back to the useless mechanic--he should have just fixed the two minors and then MOT'd it --useless prat
took my sisters car for mot, failed on 4 tyres, loads of tread but starting to crack in the tread, asked him about if the car was still tested, he said yes but mr. pold knows its failed on the tyres? as it was booked in next day for new tyres is should be ok?