This is a bit of a nightmare - a lot of people remove it because they reckon it cuts in too early.
You might find that another MOT station would let it through, although it will now be logged on the MOT computer as failing due to having no ABS. The parts to put it back on shouldn't be too hard to find.
The other thing you have to be careful of is that if you skid and have an accident and the insurance company finds the abs that could have prevented it has been removed they could refuse to pay out...