Update for anyone who spotted that in the manual. 40 quid well saved I reckon. I followed the tried and trusted fitting is the reverse of removal
approach and all is well. Think Tim mentioned it before but pay attention to the order of bits and bobs when removing the ABS sensor. The washer isn't a washer at all, but a spacer so doesn't go in where you expect it to. I never bothered measuring gaps and everything works correctly. At least the ABS light goes out once I get moving and no error codes reported.