Thanks for this Mark. We had more on Walter's maps here, but none of us had picked up this issue. Great to know this hundred year old issue has finally made it to the British Museum.
For the benefit of more recent members, I've added a "Harringay Name" tag underneath your initial post. Clicking it will link to all the other posts on this issue over the past few years.
You weren't duplicating Mark. You've added new material. Many thanks. (And yes it's not always easy to find stuff that's already on here, but always better to duplicate than not post.)