Electoral process

The continuing furore about MPs expenses and references to "the public's losing confidence in their elected representatives" should be put to the test. Complaints have been made in the last two General Elections about low voter turnout. Why don't they add a box on the ballot paper which says "I have no faith in any of the representatives who are up for election"? If that statement were to win the majority of the votes in any constituency, all the candidates would have to be replaced and the election refought.