It is not easy to kickstart a fresh musical career after you've been in a painfully fashionable – and intermittently brilliant – band. It is even harder when this is your second bash at starting out again. And harder still when a couple of months ago you trousered enough money to keep you in leather jackets for a lifetime by briefly reforming that original band for a pair of festival cameos. Yet last night erstwhile Libertine and ex-Dirty Pretty Thing Carl Barât did enough to suggest that, if he digs his heels in, his personal rock drama might have a memorable third act yet.