It’s the turn of local Liberal Democrats leader Rob Colwell to write our Friday Politics column… I’m writing this article on Sunday morning just as the London Marathon gets under way. It’s great to see so many people enjoying themselves in spring sunshine but also to see just how many of those taking part are supporting charitable causes. It shows Britain at its very best displaying a community spirit of which we can all be proud. Sadly, I couldn’t run the marathon even if I tried. But this year I am taking part in another kind of marathon, a political one. Let me explain. As most of you will …