Thanks biffa, the guy doing the work has the part which has a sensor attached, so, is it not just a straight replacement? I.e. take the old one off and put it back on and plug the sensor in. I think i'm getting myself confused. Wouldnt the old school way have been to press the old bearing out of the existing part and put just a new bearing in. If my guy has a part with a sensor attached surely that means he has a kind of a hub assembly of some sorts so should just be able to remove the same part from our car and put the new one on, connect up the sensor wire and hey presto jobs a goodun. Have been advised to be very careful if removing the bearing from the existing part due to the sensor. Is this true also?
Sorry to be a pain, my mechanical knowledge is sadly lacking!