You guys seem quite knowledgeable, still trying to sell the MK4 but its MOT runs out at the end of this month

My insurance also ran out at 14:00 today (had an emotional last drive last night

). Now my brother in law is insured to drive any car 3rd party. This would be ideal as he can drive it to get MOTed. I have a horrible feeling that he wont be allowed to do that as there is no longer any form of insurance on it or does the fact that he can drive any car 3rd means it doesnt matter what insurance is on the MK4 just as long as the person driving is insured for that car.
A bit long winded but you help would be appriciated.