You can stand by for differences of opinion in answers to this question.
I believe he will not be liable to a charge of driving with no insurance. Most policy wording states something like �.. the driver must not be disqualified from holding or obtaining a licence�.
Not holding a licence (or driving otherwise than in accordance with one) is not the same as driving whilst disqualified. Insurers are obliged to cover Third Party risks for vehicles and drivers that they insure provided the driver is not disqualified. If the offence committed by your brother automatically invalidated insurance then there would never be a �stand alone� case of driving otherwise in accordance brought to court. A look at your local court�s traffic list will show that there are many such cases brought.
There is no possibility of an additional charge being sprung upon him at the court. Although up to six points can be awarded for the licence offence the usual penalty is three points and a fine of half a week�s income.
He should certainly enter a guilty plea (this will reduce the fine � but not the points � by a third). He should ideally do this in person. This will also give him the opportunity to tell the Court that he had passed his test. He should take documentary evidence of this if he has it.
Yes, his details will be stored on the PNC system and with the DVLA. Again there will be some difference of opinion on AB, but my belief is that, whilst the police may treat them differently, motoring offences are criminal convictions.