| Thanks for the comments guys, but saving it was really nothing to do with me.
I just took my hands off because I hadn't got a ferkin clue what else to do, I just thought I had nothing to lose, thought I was going down whatever I did. Pure and utter luck that it sorted itself out.
More luck that the bike didn't veer left, cos there was a nice grass verge to lowside on, a ditch deep enough to ping me over the bars if the lowside didn't get me and a big hedge to fire myself through.
As I say, no judgement or heroics on my part, just pure and utter luck.
Never, ever, ever had a proper tank slapper on any bike before and it was unexpected on the ST 'cos they're pretty stable, but I can tell you that having the bars clack off the lock stops a dozen or so times is the scariest thing...
Don't want that again thanks | 
Jools
Threaded Mode