Ok - well he needs to get another policy.
If the Police take action then he can go to Court, plead guilty but argue special reasons.
That is special reasons not to endorse the licence.
His reasons are that he did not know about the cancellation.
If accepted then he can be convicted but given no sentence.
But the insurance company is entitled to cancel. If he disputes this then he can write and make a formal written complaint.
They will investigate the matter and report back. If he does not accept their decision he can then go to the Ombudsman.
They offer a free, independent service and can examine his complaint at: www.financial-ombudsman.org.uk
But this is what he can do.
Can I clarify anything for you about this today, please?
If not, I would appreciate a 5-star rating for my answer. If you need anything further I am available for a follow up at no extra cost.