I've just been watching a documentary on Iggy Pop and been reminded not just of his brilliance but also of his tendancy to get fully naked on stage. Now, I've got to confess that this is something that I just don't understand - I've been a gigging musician on and off for nearly 30 years and I've never been tempted to go naked. Ok, so the 20 or so most recent years have been as a teacher in school, and such things are generally frowned upon, but even in my Britpop days, I never had the urge to go