please empty your brain below

HS2 has taken a similar approach to the Gibson square Tower of the Winds for their Chiltern tunnel vent shafts, disguising it as a quaint barn.
So rare to see "shoo-in" spelled correctly. Thank you.
This classicised “tower of the winds” was presumably named after the octagonal 1st century BC Tower of the Winds in the Roman Agora to the north of the Acropolis in Athens. The reference would have been even better if they had made the ventilation shaft octagonal.

There are some wonderful ventilation shafts elsewhere in London, including the Paolozzi one near Tate Britain and the Heatherwick one near St Paul’s. More here.

dg writes: ...which is the first link in today's post.
Very entertaining, but I’m not sure it qualifies as an inherent Islington posting?

dg writes: it very much does.
Perhaps it needs to mentioned that all these ventilation shafts were originally buildings sites. The reason they are often found in yards and obscure places. They were the entry points for the tunnellers to begin their works and were often points where spoil came to the surface.
THIS is peak Diamond Geezer. Thanks
Just realised I missed one, which I am currently standing outside, and I’ll update the post later.
Drayton Park - you're nerd senses were correct, Victoria Line opened 1968-1971, the Northern City Line was in operation between Drayton Park and Moorgate until October 1975, hard to build a ventilation shaft with the carriage sheds still in use.

YouTube, before, after.
I should have guessed you would have something ultra-niche in mind!
Nice one. Not the Islington post I was expecting, bur something far more interesting.

Interesting to see King Charles' favourite architect Quinlan Terry was co-designer of the Tower of the Winds. Very much his style from the off.
A shame that heat isn't put to good use, but of course it's not part of their job description to do that.
The disused station City Road has been converted to use waste heat from the Northern Line to supply a local area.
If Shaft #6 (Ashburton Triangle) is the one shown on this map from 1953, it would predate the Victoria line and may have been dug for the Piccadilly line.
The most heartwarming thing for me about the Gibson Square ventshaft is the complete lack of graffiti.
That playground is my favourite in all of Islington - during the lockdowns I took my son to most of them!
Post now updated with an extra shaft - a brand new number 5 (plus additional sceptical commentary at the end of number 6).
Hidden London Hangouts’ tube tunnel walk from Finsbury Park didn’t find any ventilation shafts, Ashburton or otherwise.
Given the state of air quality of the tube, it’s a bit scandalous that one of the air vents is discharging into the centre of a children's playground.

Seems the sort of thing some local dignitary or politician who often reminds us he's concerned about children's lungs might want to do something about.
I did get unexpectedly close, didn't I?
From a recent FoI request regarding shaft 5:

The shaft referred to is the ‘Drayton Park Mid-Tunnel Ventilation Shaft’ and is owned by TfL. The shaft is located between Finsbury Park Station and Highbury & Islington Station and extracts heat from both the southbound and northbound Victoria Line tunnels. The shaft is mechanically ventilated using a heat extraction fan which operates around the clock.

The public cannot access the louvres (the openings where the air is discharged) as the fan discharges vertically above a roof which is inaccessible to the public.

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