You can't... contact your m.o.t station and enquire about collection of your vehicle from your home.
Who was at fault for the accident. If it was not your son it should be ok, if not I'm sorry to say he will not be covered.
I have bought a new car, the insurance quotes I have received are really expensive. My mum's partner has suggested I take out the insurance in his name and put myself down as a named driver as he has 7 years no claims. Is this legal?