http://blogs.spectator.co.uk/coffeehouse/2014/08/carswells-deflection-inflicts-damage-on-the-party-to-which-he-owes-his-career/
Fraser Nelson of the Spectator examines this decision and the fact that only a few months ago the MP was telling everyone to get behind the PM. Whether you want to get out of Europe or simply want a referendum to resolve the matter once and for all it is worth a read.