For a building built 50 years ago the BT Tower looks remarkably modern, entering the generous foyer it could be any number of offices that proliferate in this corner of Fitzrovia.

It’s only when reaching the central core you realise the structure’s uniqueness. For running up its centre is that only means of reaching the viewing platform, and the only viable way of escaping in the event of a fire.

[S]eldom seen outside expensive hotels and department stores a lift attendant is on duty as you rise silently at 1,400 ft. per minute as the counter proudly shows. He is also there to help evacuate the building, the only structure in Great Britain allowed using the lift as a fire escape

The reason I am ascending up the most iconic building in London is as a guest of Secret Spaces. It is the sort of access that Google give to their Google City Experts encouraging members to write high-quality local business ratings and reviews on Google+ rewarding members who have left at least 50 reviews to date, and who produce at least five new reviews each month. ­

The program takes advantage of an old Internet rule which states that only a small group of so-called ‘creators’ generate most of the content on the web, while the majority just consumes what others have produced. These requirements are meant to guard against spammers, and others who may be encouraged to write a few reviews in return for free stuff.

After a welcome drink we were given a talk about the changing cities by Leo Hollis, who stated that at the beginning of the century we became 50 per cent urban as a global population, by 2050 Hollis reckons urban population will be up to 70 per cent. From that he extrapolates that by the end of the century virtually the entire world’s population will be urban. So up is the only way to develop our urban living and what better place to present those views that at the BT Tower?

This was followed by a short talk of the Tower’s construction and history by BT’s archivist David Hay, who explained that the Tower is now redundant and used only for promotional work. An amazing image of London taken from the top of the BT Tower has set a new record for the world’s largest panoramic photo. The image shows a full 360 degree view of London in incredible detail.

We arrived at the famous revolving restaurant platform which takes 22 minutes to complete its circuit. It was closed in 1980 due to security fears. At the time many diners said that eating while being spun round was disconcerting. Being the highest building in Fitzrovia it has unrestricted views across London, from Crystal Palace in the south to beyond Wembley Stadium in the north.

As a so-called ‘City Expert’ much of London looks so different from 600ft. in fact I needed help identifying many buildings that I only known from the vantage point of my cab. From the BT Tower London has no edges for, as Leo Hollis predicts, urbanisation stretches for as far as they eye can see.

Pictures: Aiming At The Sky – London BT Tower; BT Tower (Post Office Tower) – London Skyline by Simon and his Camera (CC BY-ND 3.0)