Well, its hard on Evans, in the same way as everybody else who is found not guilty, but I'm not sure what can be done about the situation. I asked a similar question when DLT was in a similar position.
Its seem that under the British justice system, you have two choices if brought to court....you either fight your case and face financial ruin if you win, or don't fight your case and be found guilty, thus going to prison, and face financial ruin anyway. Its a bit like the old test for witchcraft, by ducking stool. If you survived, you were a witch and was burnt at the stake, but if you drowned you were innocent.
We have our share of legal eagles here on AB...perhaps they have some input that could be helpful. It would seem reasonable that if he could demonstrate that he was wrongly charged, then a refund of his legal expenses might be considered. But we would be opening up a huge flood gate if we simply allowed all "not guilty" people to claim their fees back.