Hi Jeff
Thanks for the info - I have walked along that boardwalk many times! Absolutely no rush to check the seat, whenever you are passing that way is fine.
I managed to get down to the boat myself last week. Picture is on the Old West River, which connects the River Cam/Ely Ouse to the Great Ouse. It used to be the main river before the fen drainage works diverted the main flow of the Ouse direct to Kings Lynn.
IMG_20170718_054318 by
Mike Starnes, on Flickr
Mike