Dad's S1 needs a new set of rears. Is the dealer the place, or can you get them elsewhere (Eliseparts seem to have them in their catalogue but I've no idea if that's a good price??).
Try phoning around the dealers - I saved nearly £80 on a set after almost going for the 'best' quote. And that was still at a main dealer too. PM me if you want a number (claiming local club membership helps too...)