The fat green arrow bent left in a right angle. Guide? Instruction? Or imperative – if we were to arrive where we were going in time. I hadn’t used a satnav before, but taking my friend to an early hospital appointment made nose-following less than wholly wise. (And as it happened, we were led into a dead end because the satnav didn’t know about a new road.) The fat green arrow at my next glance was straight. We were going from A to B still, just as we had when we pulled away in Hove, but without it really registering…