Got some ABS rings bought of the correct size (15mm) which were £5 for two on ebay... why fit the wrong ones?!?!
Anyway, didn't really face any problems in changing the rings, pretty straightforward but it was made harder by having frozen hands and it snowing halfway through the job. All back together, and out for a drive and I no longer have any ABS/ESP/Serv lights. Car feels different too, maybe because i have ESP/traction control working now? Seems to brake even nicer which is always a good thing. Feels strange not having a christmas tree for a dash!
Only light left is the EML but that's from the decat that's on the car.
I also replaced the cable tie holding the boot with a proper jubilee clip. I checked the grease inside and it did have some in there, but i'll get some bought and shove some more in just to be on the safe side. Slowly getting the car to a better standard