Craig, phoned your friend, George. Very helpful, but could not supply at the moment. Really nice guy, rang me back twice to see how I got on. He referred me to the German EBay site, where they had the abs rings for sale at 38 euros. My customer had called into another dealership, where the parts man told him that the ring came with the wheel bearing. Customer said OK, I will buy the wheel bearing just to get the ring. When they looked on the parts list, the ABS ring was listed as a separate item, complete with part number and price! £8.38! Great result! Should have gone there first!
Thanks to both of you for your help, best wishes, Gwyn