I was just approaching this junction at the tail of a queue of traffic (roadworks previously had ensured this), slowing down to stop in the right-turn lane when, as I got past the end of the Taylor Vinters building, a strong gust of cross-wind hit me and all of a sudden I'm doing that whole flying in the air thing.
Next thing I know I'm mostly underneath my bicycle about a foot and a half away from where the wind hit me, in the middle of the white-slashed central triangle. One leg was entangled rather in my handlebars which provided a slight barrier to freeing myself but I'm sure that if I hadn't managed it then the person who asked if I was OK would have helped out.
I walked the rest of my way to work. I appear to have suffered large grazes on my left elbow and knee and torn a nice big hole in my trousers, but otherwise come off OK.