Fab,
Agree with you totally about the charges, and the accounting philosophy. You won't get any arguments from most people on that one.
IMO they split the charges between those separate divisions (TWR, TMA and ENROUTE) so they can maximise returns in one area and get rid of the rest, the thing is who's going to buy a privatised area of business that can't make a profit? You'd have to be incredibly stupid! (understand there's a few of these around in this industry).
Back to the philosophy of privatising a safety organisation in the first place, the taxpayer already owns this mob and deserve a level of protection in this industry that isn't dictated by profits etc. Like I say, good luck getting a refund. Just have to ride out this ridiculous philosophy of economic rationalism!