Above is a non-artist’s impression of my cycle journey home yesterday, after an area of south London between Vauxhall and Camberwell lost power at about 4 o’clock yesterday afternoon.  Am I alone in feeling a small charge of excitement at the vaguely post-apocalyptic scenes of backed-up traffic crawling through interchanges with no street lamps or traffic lights, police sirens wailing in the near, middle and far distance? There’s just something about a non-fatal state of emergency…