When Osborne suggested a flat-rate tax before the election of 2010 he was derided as a fool, yet a tax system with no loopholes is exactly what's needed.
Many (30?) years ago I read an article in the Economist where someone had calculated that a flat rate tax in the UK would be somewhere around 15%. The problem is that people hate the implications. Earn the first pound you ever make, pay 15p. Earn the pound that takes your income from £3 million to £3,000,001 and pay 15p. People were immediately on Osborne's case saying it was "regressive". However, it's becoming more and more apparent that the guy increasing his salary from £3m is probably paying nothing on the increase (thanks to a million loopholes), so in fact it'd probably make richer people pay more.
It would also obviate the need for an army of accountants to fill in tax returns and run the various avoidance schemes. It would allow them to go and do something productive. And all the lobbyists looking for tax breaks for their industry could go and retrain as nursery teachers.
Vin