Last night, as I was waiting for my friend to arrive, I put the Radio Two Jamie Cullum Jazz Programme on for some diversion. Once again I have to conclude that he is the most boring man on radio. The dumbing-down of the jazz content on his show is bad enough – it avoids the seriousness of John Coltrane/ Sun Ra-era jazz the way Labour avoids any public connection with the unions – but Cullum’s vacuously enthusiastic twitterings drive me mad. The last time he was on I actually told the radio to shut up in an empty room. And then I turned it over. I should have known better last night too – same show, same presenter – but can I be blamed for my goofy optimism?