Labour sources were last night unconcerned by the Tories’ announcement that “the next Conservative government” will introduce a 50% threshold for strikes. Frankie Maude has pledged to force unions to secure a “double majority” for strikes to be legal, a majority of members and a majority in favour of industrial action. On the face of it this seems another welcome trade union reform by Maude’s Cabinet Office, though if it is conditional on the almost impossible event of the Tories winning a majority next year then it is little more than window-dressing. As the Telegraph’s Polling Observatory shows today, it will take a small miracle for the Tories to do so. So far the LibDems have resisted union reform this time round. If the Tories are serious, this needs to be a red line in coalition negotiations after the election…