hi Rob, is it the top spray arm not rotating?,look at the grey tube that runs down the back yo the arm.Is it loose and come away.If so, you will need a part called a COVER, they are about £15 plus vat and postage.If this is okay and the water just bubbles instead of sprays, you will need a recirculation pump and fixings kit.That is £122 plus vat and postage.All the best.
FOXY
October 2008