please empty your brain below

I like waterfalls...which makes me wonder where is the nearest one to London? I am right in guessing there are none in London?
Beech Hill Lake is described as Jake's Lake on the map - which has been its usual description locally.

As I understand it, you could drive the length of the London Loop between Hadley Wood Road and Cockfosters, the narrow footbridge was for pedestrians and cars drove through the water.

The bridge over the ECML was replaced during electrification and the road was closed off, but the valley road section immediately to the east was a popular 'cars driving along roads' filming location in the 60s and early 70s.

The railway bridge over the ECML was also better known for the nearby Greenwood signal box, it's the bridge in the background on the Terence Cuneo painting/BR poster 'On Early Shift'.

http://www.originalrailwayposters.co.uk/product/on-early-shift_cuneo
Grumpy Anon, there is one in the Kyoto Garden in Holland Park.
There's another waterfall in the grounds of Chiswick House. Smaller than the one in Holland Park, the 'Cascade' feeds in to a river that may or may not be part of the lost Stamford Brook http://diamondgeezer.blogspot.co.uk/2010/09/chiswick-house.html}
There's one at the east end of the Serpentine.
A fine walk. I did that part of London Loop Section 16 a couple of weeks ago. I saw lots of signs for the Dollis Valley Trail, but didn't notice any for the Pymmes Brook Trail!
Luckily it's fairly close to me so I will have to plan a return visit.
Does Teddington Weir count as a waterfall?
Oakleigh Park is indeed a nice park, it was one to which, in my (distant) youth, we used to have occasional car trips. I can't remember exactly what the attraction was. But some lower parts of Pymmes Brook provided very nice footbridges in parks under which one would try to clamber without feet getting wet. That was excitement, back then.
Relating today's post to yesterday's (sort of), you can see "The 13 Best Places for Waterfalls in London" at https://foursquare.com/top-places/london/best-places-waterfalls, created by an outfit called "Foursquare Lists" (and including the rather desperate inclusions which give the definite impression that London does not actually have all that many waterfalls, or at least, very few visible from across the pond).
Is the 'blue' because people haved mentioned 'waterfalls' a bit like the 'green' that was used to highlight people mentioning the Green Line buses?
Yes, it's an appropriate colour used to separate out two distinct threads in the conversation.

It's not a passive aggressive symbol of my editorial self-importance, if that's what you were thinking.

I like it!
Ben Aaronovitch must hear of this!
As a child in the 1960s I remember a spot in East Barnet where the Pymmes Brook emerged from a tunnel - I suspect it was in front of the Gunshop that you mention, which looks like the same spot but more overgrown. On its covered route between the Brookhill Road/Brookhill Close junction and the Gunshop I think it passes below the small patch of public greenery within Doggetts Close. There used to be an inspection cover on this green space and I remember hearing the sound of running water when I put my ear to it.










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