Thanks Tunnie for that excellent and detailed reply.

Should I complain to the DVSA about this?
Surely all MOT testers should give the same results. If all the test results are different then what's the point of it all? Surely a component is either faulty or it isn't?
Is it the case that if something has the slightest bit of surface rust then it's a fail?
The rear suspension arm failed the MOT standard last month but this month it's fine?
It's the same for the anti roll bar linkage.
Does this mean that these components are fine now or do they still need to be replaced?
I'm worried that I might get everything fixed and then the poor miggy fails on 16 different items.

Maybe I need to have a poll. Fix or scrap!