please empty your brain below

I do like the first picture. Quite magical.
Fascinating! Great read.
One minor disappointment can be that trig points aren't necessarily on the highest point of a hill if a slightly different spot gives a better line of sight from elsewhere.
I'll be up Horsenden Hill next month as part of the Capital Ring, so I'll look out for that one - thanks.
Pole Hill trig point is a short(ish) walk from Chingfprd Overground and well worth a visit for historical reasons too (but on a day when the trins are running).
The whole story of the ordnance survey is fascinating and well worth reading.
Did anyone else think the first photo was of the pillar doing a wee?
I hadn't thought of that - I saw it as a rainbow that had been out in the sun so long that its colours had bleached out. But I won't be able to get the other idea out of my head now..
I was a member of the Charles Close Society for a number of years. Interesting but perhaps a bit too intensely focussed, despite my abiding map obsession. I just wasn't obsessed enough, comparatively. Great post DG.
Grew up near Barn Hill and spent a lot of time when younger sat on (or attempting to sit on) the trig point there.
Fascinating!

The Selsdon Park and Layhams Farm links both point to the latter.

dg writes: Fixed, thanks.
Should Dagnam Park be in red?
Not sure how accessible they have to be to be coloured green, but you easily see and can get within a couple of metres of the Chessington one at the end of Vivien Close. See here.
Dagnam Park and Chessington are both linked from the phrase "clearly visible" in the last paragraph.
My grandfather, Brigadier Martin Hotine, was in charge of the retriangulation of the UK. He designed the pillars which had to be made at the site. There is a memorial stone to him outside the Ordnance Survey headquarters in Southampton.










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