Lets get some things straight.
No it is not illegal to get the CB paid to the Ex, and if the Ex wants to increase his maintainance payments or pay for things for the children himself, that is not illegal either.
Hell, even giving the money back to her in cash is not illegal, although morally questionable as the whole reason for transferring it is that she is no longer entitled to it.
I think what people are trying to get at is that technically this will get around the CB cap which makes the changes to CB partially useless.
On the wider issue of CB, I think we can all agree that taking CB from HRT earners and not Means Testing it is wrong, if they are going to do it, they need to do it fairly. 2 Parents earning 35K each can still receive CB whilst one earning £45 can't? that must be wrong.
As for the fact of removing a "universal Benefit" well hate to tell you people, but the UK is in £1 trillion of debt, sorry, but cuts have to be made before the whole thing goes down the plughole.
Putting some perspective on this:
CB for 1 child is currently £80 per month (£960 a year), to a houshold earning £60k that's an increase of 1.6% of thier income.
The same household earning 16k, that same £960 is a 6% increase in total income.
If the country needs to make cuts, who can afford to lose that £960 more?