If your vehicle fails its MOT then a retest must take place.  There are three types of retest possible depending on what the vehicle has failed on and if it has been taken away from the site where the MOT took place.  The three types of retest are 1) Free 2) Partial 3) Full.

If the vehicle is brought back to the same mot testing station before the end of the next working day for one or more of the following items then a free retest will take place:

Bonnet, boot lid, brake pedal anti-slip device, direction indicators, doors, drop sides, fuel filler cap, hazard warning, horn, lamps, loading door, mirrors, rear reflectors, registration plates, seat belts (not anchorages), seats, sharp edges or projections, steering wheel, tailboard, tailgate, tyres, vehicle identification number, windscre and glass, windscreen washer and wipers, wheels.