My theory on Van Leyden's Sluice

I'm reading Dorothy L Sayer's Nine Tailor's at the moment which is set very much on our doorstep, so to speak. Although really well researched Sayer's not only changes the names of places but skews their positions on the landscape so just as you think you have nailed one location a small phrase throws things completely. It's doing my brain in trying to place things in the landscape and MrsW is convinced I'm becoming obsessed so rather than whitter on to her I might post the occasional theory on Blip. I love the people on Blip so don't take this wrong please but sometimes I find it a great tool for talking out loud to myself. Do please join in the conversation if you're inclined! Anyway here's my theory on the whereabouts of Van Leyden's Sluice: 
"Ah! look—over to the right—that must be Van Leyden’s Sluice that turns the tide up the Thirty-foot Drain—Denver Sluice again on a smaller scale. Let’s look at the map. Yes, that’s it. See, here’s where the Drain joins the Wale, but it meets it at a higher level; if it wasn’t for the sluice, all the Drain water would turn back up the Wale and flood the whole place. Bad engineering—but the seventeenth-century engineers had to work piecemeal and take things as they found ’em. That’s the Wale, coming down through Potter’s Lode from Fenchurch St. Peter. I shouldn’t care for the sluice-keeper’s job—dashed lonely, I should think.”They gazed at the ugly little brick house, which stood up quaintly on their right, like a pricked ear, between the two sides of the Sluice."   Dorothy L Sayers. 

 
The blip I've shown is taken from Salter's Lode on the West Bank of the Great Ouse near Denver Sluice. Salter's Lode has two small sluices and a lock gate. Neither of the sluices or the lock is in the photo.One sluice, which governs the flow from what is actually The Old Bedford River, is behind me (that is the Old Bedford River entering the Great Ouse in the foreground of the photo). The other sluice and the lock gate are hidden behind the house on the left of picture which also hides the point where Well Creek enters the Great Ouse. The house, I believe, is the sluice keepers house referred to in the passage, although I think the present owners would be rightfully indignant at Sayers' description "ugly little brick house". 
I'm sure you were fascinated by that! If not please feel free to gaze into the sunrise in the extra, taken across the Great Ouse from the same spot.