The instructions to participants stated that this circulation is chosen as the alternative would cause difficulty for pairs. I don't know how true that is - have they even asked the pair-boaters*? But it would involve the pairs going up the North Oxford beyond the start of boat moorings on the towpath side and any boats moored to the sanitary station mooring on the offside, so potentially less room to manoeuvre for a motor trying to reverse its butty around the turn.
* Since Raymond and Nutfield are based at Braunston, I suspect if any pair-boaters have been asked it would be them. Yet if this year's performances are anything to go by, all of the other pairs that took part were in much more capable hands.
I thought Nuneaton and Brighton this year were handled much better than I have seen sometimes in the past. The boats were well turned out too. A credit to the current crew.
Those of us on historic boats moored up by the ladder bridge, and in the last cohort to do the parade, noted that there were periods when we had a succession of boats making the turn out of the marina, followed by some very long gaps. I hope the organisers have taken note and can perhaps bring forward the start time for some of the groups to maintain more continuous activity.