At the lock, we had to wait for a full barge to come through. I watched it being moved slowly in to the lock, and then I (helpfully I thought) closed a gate behind it. I was about to close the other when a workman rushed over telling me to leave it – there was a boat coming in. At that point he realised that the boat was already in – so we carried on. We had a pleasant chat while we worked the lock together.