I think what would help is just what Sue suggested.
Just don't tax people at the bottom end of the scale so damned much.
The 'forms' for tax credits. OMG! It's a f*cking BOOK.
My DH has extreme learning difficulties. He was completely unable to make heads or tails of that excuse for a 'form'.
I have a university degree and still had to give it my undivided attention.
So you can imagine the clerical errors that result when all that info has to be keyed into the system. That's what happened to us.
I think taxing people less lifts them out of a poverty, not this ridiculous tax credit system.
I completely lost faith in it after what we went through.
We don't bother claiming them any more at all, despite being pretty hard up, b/c we don't want to live in fear of getting one of those letters in the post telling you you 'owe' them thousands of pounds you don't have b/c . . . well, shit, you're so poor you actually needed them in the first place.
Talk about kicking people when they're down!