It’s by-election day in Batley and Spen tomorrow. The only constituency polling done in the West Yorkshire seat suggests that the Tories stand a good chance of grabbing it off Labour, with the intervention of George Galloway threatening to turn the seat blue for the first time since 1997.

In recent weeks there has been much commentary on how the Conservative party can balance its delicate electoral coalition between the red wall in the north and the home counties in the south, following the Chesham and Amersham upset. Mr