from Gov.uk:
“Failing the MOT
Your vehicle will fail if the test result lists ‘dangerous’ or ‘major’ problems with your vehicle. You might not be allowed to drive until you fix the problems.
You might also get a list of ‘minor’ or ‘advisory’ problems to monitor or fix in the future.
If your vehicle fails the MOT:
you’ll get a ‘refusal of an MOT test certificate’ from the test centre
it will be recorded in the MOT database
You can appeal the result if you think it’s wrong.
Driving a vehicle that’s failed
You can take your vehicle away if:
your current MOT certificate is still valid
no ‘dangerous’ problems were listed in the MOT
Otherwise, you’ll need to get it repaired before you can drive.”