At one point I heard splashing behind which turned out to be a canoeist catching us up. I tried to move to one side to let him pass. Unfortunately he misread the manoeuvre and tried to overtake only to realise that I had unintentionally cut him off. I apologised for breaking his rhythm, he was pleasant about it all and whooshed on. Later, when I saw him coming back, I gave a clear hand signal and he passed with a smile but no pause.