Good result in the end, 9 times out of 10 it is always the rear OS bearing, at the same time check and clean the back plate, remove any flaking rust, treat and coat with some black paint, if to bad then change the back plates.
As stated T4 would help with finding out which bearing it is.
1
Front
1a
If you do not have access to one then a simple set up plugging in a new sensor may help.
2
3
Readings should be 1.72
4
Also 0.67
5
When turning the wheel while jacked up.
once you have found the problem which rear bearing it is as above check the back plate for corrosion and treat or replace.
6
7
8
you can see the corrosion flakes on this bearing.
9
If all this fails then look at the pins in the ABS modulator.
10
Glad you got sorted for the mot.