Must confess that I had a couple of surprises on the first few canal bridges on my way home (heading east along the towpath). People seemed to appear out of nowhere and it seemed to be much more reactive than it normally is.
I usually judge my speed by the effort I'm putting in, and it took me a little while to realise that the wind (while not obvious in the way a strong westerly usually is) was pushing me along at a fair few miles an hour quicker than normal. I was thus approaching every bend and blind bridge quicker than usual or sensible.
I started using my GPS speedo a bit more, slowed down to my normal pace (which felt very easy today) and amazingly all the surprises and reactive braking disappeared. It was odd, because normally I can tell it's windy and make allowances, but for some reason today the wind wasn't visible.