Spotted...

And a rider who had accidentally deflated her tyre at the apparently (I didn't test it) non-functioning public bike pump outside Lock 7 when she went for a top-up. I stopped and helped her. Those pumps are definitely work in progress; unfortunately, the valves aren't yet robust enough to withstand being constantly wrecked by people who don't know how to use them. :|

I did exactly this on the one in Kingston , didn't even have a puncture just let my wheel down to try it out , wasn't so fun when it didn't work