I suppose the people most put out by the swimmers would be hirers, especially of day boats, who may not have been warned of the event. As long as boat owners have plenty of warning of the race, we can keep away from the area for the short time it is on. I didn’t see any notices about the event and I was around the Waveney area for the three weeks preceding. It is only because I was aware of the race from last year that I made a point of looking to see when/if it was on. It is only one day but I don’t think it should be left to the race safety crew to be directing other river traffic and actually making them stop. That should be down to the BA rangers imho.