i think throwing it away and claiming hes never even seen the clamp would be the easiest choice, but i spoke to someone who lived in the flats over looking the car park and they said theyve seen the clampers taking before and after pics of the clamps once there on cars. so unless he claims some good samaritan must have removed it he would probably get done for it.
also they will have taken pics of his number plates so will eventually track him down? unless they cant be bothered.
he was going to weld the clamp back together, grind the welds down then skim them with filler and paint over it. that ways theres no signs of previous damage. so therefore hes broken no laws and can walk away without paying. a lot of effort but better than paying the fine and a slight bit of satisfaction at the end i suppose. and better than getting done for criminal damage.
and as said above even if they notice the welds they cant prove it wasnt like that before it was on my car.