Cause the front one on mine crumbled away yesterday when putting a caliper on....if it is a fail, how hard are they to get and put on

I've never heard of a car failing for that and have posted the new M.O.T list but I guess you never know, but I doubt they would fail it for that. And to buy one I think they are apart of the hub so would need to get a complete Hub :(

Ok, well that's something less to worry about then.....a few others though

I removed mine when they crumbled on a car I used to have - went through the mot no problem, as long as the brakes work as they should there shouldnt be an issue

i've had cars in the past that i have removed them off and never had them fail

Ok cheers