But if it fails the early test it fails full stop. You don’t have a month to drive it around and get it fixed just because it wasn’t actually due an mot until x date.
Not 100% correct unless it fails on a safety related item. The original MOT that is still in date means that the car is still MOT’d until the original expiry date. If you failed on a faulty tyre the original MOT would be valid but you will still get fined and 3 points for driving with a defective tyre. You won’t get done for no MOT.
If you failed the new test on a something like an Engine Management Light you can still drive it until the original MOT expires.
The MOT test is only for the condition of the vehicle at the actual time of the inspection. It is up to the driver to maintain the vehicle in a road worthy condition at all times.
MOT rules are a minefield with all sorts of interpretations made by different Testers and Test Centres but the bottom line is that you are responsible for the condition of your vehicle at all times even if it has a valid test certificate.