Ok I admit it, it was me, I noticed a strange clunk when out the other day and it only happened when I leaned into a corner, didn't think to much about it but I was getting worse all the time and giving some odd handling, sort of rolled into the corner and then flopped over a couple of inches half way through, bit scary actually, so was checking the oil and happened to look up under the handle bars and would you believe it NO BOLTS IN THE TOP of the head stock!!!!!! Both bolts gone AWOL and of course the forks were wobbling about all over the place, a lot of swearing later about useless bloody Japanese crap when it occurred to me that I had not checked the bike out over the winter and it's not the bikes fault but the dumb arse sat on it!!!! So out with the spanners and socket set and I found about 15 bolts that had been slowly working them selves loose over time, so if you want to avoid feeling a right twonk then have a look at your own bikes and I bet that you find some loose on yours to. I have now used thread lock on anything that moves and will be checking every 500 miles or so.
PS 2 allen bolts on the clutch casing (lower) were missing as well DOH!