If you're still interested in the HRC quick action throttle I came across an old thread where the guy bought the kit for £44 from: http://www.tsrworldwide.com Here is the thread: http://www.1000rr.co.uk/threads/hrc-quick-action-throttle-info-please.21423/
Thanks very much for the heads up and the links. I was leaning towards accosato but I've emailed the guy in trs. If he comes in at that money, that's a real winner.