HEALTH Secretary Alan Johnson is being lined up to act as emergency Prime Minister amid growing concerns among Labour MPs about Gordon Brown’s state of mind. The 58-year-old could take over as an interim measure if Mr Brown quits for the sake of his own health after an expected meltdown at next month’s local and European polls. A former postman with a common touch, he is seen as the candidate the Tories fear the most. Senior Labour sources said last night he would be the “magic wand” solution to avert a landslide defeat at the next General Election. An increasing...