The next milestone on the road towards remaking the political landscape of Britain is the Newark by-election next Thursday where David Cameron is defending a Tory majority of over 16,000. I am not making any predictions about what will happen in Newark. But here is one fact worth bearing in mind. In the council area covering Newark, Ukip was the winner in the European elections, beating the Conservatives by 32 per cent to 31 per cent. No wonder that Mr Cameron is throwing the kitchen sink at Newark. The loss of a 16,000-plus majority would send huge shock waves through his party.