M.o.t Certificate

[samsong7]

The following question arose in the pub last night. From a legal point of view, If you take your car for an M.O.T. test 2 weeks before the certificate expires and it fails, what offence (if any) would be committed?
You still have two weeks left before your certificate expires, so you cannot be charged with not having a current test certificate, but could you be charged with having an un roadworthy car?.
As you already have a current certificate you would still be able to present it to the police if needed.
The DVLA computer in Swansea will show that the car has an MOT, so what would be the outcome??