re-insuring a write off

[classic]

Briefly my daughter was stopped at zebra crossing and a numpty ran into the back of her micra. Its a 1995 car and all the signs are that the insurance company are going to say that it is beyond economical repair, which means that they will offer her about £800.00. Now to cut a long story short an aqaintence knows the garage owner where the car is at present, he says he has had a word and that the car can be repaired cash in hand for approx £300. And then it only requires an MOT to make it insurable again.If she buys the salvage from her insurance company. So first question is this right. Second question how difficult is it to re-insure a car that has been written off. Many thanks in advance for any advice