introduce a Whistleblowers’ Act which guarantees to pay frontline public-sector workers a percentage (say five per cent) of any savings achieved if they report examples of waste to a reorganised, effective NAO, saving at least £10bn.

That gives us around £33bn a year. Then there are a couple of easy one-off quick hits available by scrapping a few white elephants.

The £5bn+ ID Cards programme should be abandoned. If in a few years, another country successfully develops an effective system, the UK could adopt that system at a much lower cost than trying to develop its own.

The NHS computer system project should be stopped immediately, its proposed database of our records should be dropped, the project's management replaced and the NHS's IT systems budget reduced by £5bn. The new management

should then come up with proposals as to how the remaining money can best be used for the benefit of patients.

We should hand the 2012 Olympics back because it is now clear a mixture of incompetence, arrogance and greed from those bringing us the Games mean the UK cannot stage the Games at a justifiable cost. Hopefully the Games can then be held in Athens both in 2012 and in the future. We may have to pay a few billion in compensation, but this will save UK taxpayers more than £10bn.

So far we're over £50bn. But there's much more that can be done to save taxpayers' money without having any negative effect on public services - in fact they would probably improve. If David Cameron wishes to find out more, he is welcome to get in touch.