Spent after an effort and just pulled on the front brake too hard - over the bars. Just replaced the ultra-light Plant X CNC front brake with a real dual pivot one so that’s what probably made the difference.
Last time I was in Homerton Hospital it was the left CB. I’m getting a name for myself.
At least you didn’t break your collar bone on the way back to the HQ.... AND get roundly beaten by @cjr