Something of the same thing posted months ago so just updating although this offer does not require a voucher / coupon.
previous post - http://www.hotukdeals.com/deal/457481/mot-only-27-nationwide
Car MOT @ Nationwide Autocentre (AA) NOW £27.00 WAS £54.00
For a limited period you can get a 50% discount off your MOT at any one of our 223 Autocentres across the UK.
There is an option to select that you are an AA member to get more discount BUT do not select this as although it does give you more discount, this is taken off the original price of £54.00 not £27.00 so effectively paying more overall.
e.g. selecting AA member option I would pay £36.18 but not selecting it means I still pay the £27.00.
Good deal if you are in need of a MOT shortly.
No need for any voucher / coupon