Although the Thames is wide, there are times when it can feel crowded. Two boats were approaching us at speed on a corner and they were level with each other. Once one had overtaken, then the much larger one behind it signalled that it was about to turn around with its horn and began to make a turn towards us. I slowed and hoped to wait for it to finish, but they waved me past in stead, so I hurried past. We are far from the fastest boat, one of the slowest in fact. I passed and it took a while to turn but by the time we had reached the nearby bridge it had almost caught up with us and held back to follow me through the arch before overtaking once they were through it, with a wave. We were to see that boat a few times. We saw the flotilla moored up for lunch at The Swan and as I was driving into the next lock a short while later a boat called to ask me if they were still at The Swan. We were ahead of them into that lock.