Did the mot testers course in Jan. ....straight from the horses mouth.
When your car passes a MOT the expiry date is the expiry date. THE END
Its a legal doc and can only be revoked by the Queen.
You can have as many MOTs as you like and your car can fail everytime....it does NOT cancel the unexpired MOT. In the eyes of the law you have a valid MOT.
A valid MOT does not mean your car is fit for the road. It means it passed the MOT on the date of the test.
A car can fail on a 1000 items and be declared dangerous to drive at a MOT but you can still drive it away if you like. No MOT station can stop you from driving away if you pay for the test even if your car as broken in half and has 1 wheel