There are two problems with this Peter Jackson documentary. The first is that it is far too long – are casual fans really going to sit through 9 hours of a band bickering? The second problem is that it is far too short! Beatles obsessives (like me) could happily drink in a hundred hours of this stuff. Bits of it are just sublimely beautiful. Listening to George Harrison’s first performance of I, Me, Mine is breathtaking. And then it is devastating to watch the fall-out as the emotional…