True, but you will have had a payout that will pretty much have covered the value of the car anyway; I understand that if an insurance company lets you keep the car then they dock about 10% of the payout value.
So, decent S2 = £4k.
Smash the rear screen. Insurance pays out £4k minus the £100 excess and 10% to allow you to keep title to the car = £3510.
New rear screen from a breaker = £150 (guess). You get to keep the car, plus a payout of £3360.
Please do check the maths, but with nearly three and a half grand in my pocket I could happily sell the car for a fraction of its value.
Oli.