Elaborating
....
If you take the vehicle (car or bike) for an MOT WITHIN it's current MOT expiry date, and it fails on something major (deemed a "dangerous" fault) - even though your existing MOT hasn't yet expired, your vehicle IS now legally considered dangerous to drive, and you are not aloud to take it back onto the road (for example leaving the MOT centre to drive home). The Police can stop you and prosecute.
If your vehicle fails the MOT with 'Minor' faults only, you are still good to drive home or keep using the vehicle until you get it re-tested / within your existing MOT period.
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QUOTE:
Previously, if your car was deemed roadworthy, you could keep driving it even after it failed, provided the old MoT was still valid.
But under the new rules, the moment your car fails, it can be rated as “dangerous” - a new type of MoT category - and driving a vehicle which falls under that defect category means a fine of up to £2,500 and three points on your licence.
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...Therefore for all future MOT's I'll book in the car, as well as book a taxi for the ride home!