During Thom Yorke's rare solo performance on Sunday afternoon at the Latitude Festival's Obelisk Arena, some misanthropic wag in the crowd said loudly:  "I wish they'd put the big screens on so we can see how bad his hair looks."   I'm happy to say it wasn't me. I had mixed feelings about seeing Thom Yorke at Latitude, but it had nothing to do with the state of his hair or even the redundant 'h' in his forename.  It had been twelve years since I'd seen Radiohead for the first - and, as it turned out, the last - time.  That [...]