Fingers crossed for you! But think about it, if you are maintaining the bus properly there should not be anything wrong at all. You, like the rest of us, are running around with our most treasured possesions aboard, ie Mrs Slammedresto and young Master Slammedresto! No one is perfect (Christ, the things I have got wrong or missed) but that is the point of an MOT test, to spot any faults that could cause a problem. If a vehicle fails the MOT test then something needs fixing. (disregarding dodgy number plates and the like). Doubt there will be a problem, I know your bus is well cared for, but good luck anyway!