It had already occurred to me that he might be ADHD. However, I've just read an interview with him in the In Gear section of The Sunday Times and in it he exhibits at least half a dozen symptoms/traits of ADHD. I reckon he really is now. The thing is, if he knew and was treated, he might lose more than he gains. His ADHD probably means that he says and does entertaining things which he'd think better of or not at all if he were medicated.