UKIP is on course to crush the Conservatives in the Rochester and Strood by-election, according to a new poll last night. The Survation poll for the Unite trade union gave Ukip candidate Mark Reckless a 15-point lead over his former party. The lead has widened by six points since an identical poll last month, and suggests that a huge Tory effort to hold the seat is failing to gain traction. The poll puts support for Ukip on 48 per cent, with the Conservatives on 33, Labour, who came second in 2010, on 16 per cent, the Greens on two percent...