At Streatham, there was a chap flying a NASA wing in a reasonably gentle wind. He was a big chap, and had a couple of other burly fellows to hold him down at crucial moments. I'd hate to see what happened if the breeze got up.
I remember kitejumping and buggying starting in this country (though you could argue the latter went back to Lockdo), and seeing a guy held aloft by a train of Codys (which is, pretty much, what they were designed for). Awesome stuff. And I am, quite naturally, deeply jealous of the skill and balance of kitesurfers, even if I have no desire to join in their madness (partly, I confess, because of the entirely predictable outcome of attempting such activity with my level of eptitude and co-ordination when using both hands).