I just found this super duper web site on the history of the Lee and Stort navigation. No time to read it all now, but I surely shall, because it has the info on George Jackson /Duckett (see previous post)
Warning: for anoraks only. Unsuitable for normal people
PS I now find that John Halfie discovered this site only the day before I did and wrote up some of it on his blog. It seems he was looking for info on Ware weir and found it , and I googled Ware Lock and found it next day. Spooky. Interblog telepathy needs some serious research.