New rear bushes will transform it mate. Did with the saloon and avant. Best thing we did
Mine was weeping from the cooler connections.
Its completely different to FWD.
FWD has a torsion beam axle, with two big bushes that attach the axle to the car.
Quattro uses double wishbone independant rear suspension, which has 3 bushes (some of which are two piece) on each wishbone, meaning theres 8 bushes per side, plus the track rod and ARB drop link.
Unless its vosa that are testing it i wouldnt worry to much, with it being a track car unless its your daily you could just leave it a month then take it elsewhere see if it passes but you would be paying twice.
Best bet is find a mot tester who's not an **** hole and takes beer tokens
Evidently your an MOT tester who cant read your own test manual.
There is no REQUIREMENT for the car to have washers. The manual clearly states it MAY have washers, and if it does, they must work. If it does not have washers, its not a fail.
Note in the "Reason for rejection" column, that theres no mention of a MISSING washer system. Only that a washer system which is inoperative. Something which isnt there at all, cant be inoperative.
Whereas for instance a MISSING headlamp switch is a fail, and it says so.