Hi sinex, can I ask if you ordered this to be fitted or if it happened to be on the bike you bought? I'm also in the UK and have been told the part is out of stock 'til the end of next month Yes, I've flicked into S mode, still with <600 miles. Can't see the harm in it -- manual doesn't say you can't use it while running in (unless I didn't read carefully enough!), but I am paying attention to recommended rev limit. Give it a shot - makes a big difference to the bike and may change your mind about keeping... The fueling is absolutely immaculate and the shaft drivetrain is the best of its type (least obtrusive) that I've tried.