Thanks to everyone for their tips. Unfortunately this business trip allowed very little time for shopping. Tokyo is possibly the most exciting city in the world, but if you're only there for a week (as I was) you never really recover from jetlag, and the last thing I wanted to do with what little spare time I had was shopping.

I had a wonderful trip, but just half an hour in HMW Shibuya, where I only bought English Rock, I'm afraid, 3 much missed King Crimson albums, Larks Tongue in Aspic, Starless and Bible Black, and USA; KC's output being sadly missing from iTunes, as is Fripp's solo work.

Couldn't find any Roy Harper I don't have already, and sought out Oliver Nelson's Jazzhattan on CD, to no avail. Rather off-message I know, but any pointers in the direction of where this might be available on CD or downloadable would be greatly appreciated.