What do Ben Stiller, Sean Penn, the chairman of the BBC, Piers Morgan, and, er, me, have in common? The answer is that we’ve all been banned from Russia. For some of us, that’s a blow. For others, an irrelevance. But for all of us, it’s a strange accolade: somehow Vladimir Putin’s Kremlin thinks we’re significant, dangerous or hostile enough to need to be kept out at all costs.