FNG.. The pad you refer to is on a very anonymous building occupied by a very well known worldwide diamond dealing company. It is used morning and evening by the boss in his silver/burgundy 355F2 and has been for 10+ years. I used to work just down the road in New Fetter Lane in a higher building and saw it very regularly. Very interesting watching the established landing and takeoff patterns - the latter in particular. They ascend rearwards to about 100ft, keeping the pad in sight for emergency landing purposes, then commit to the ascent from where an engine failure has to be carried with you...
Other rooftop pads in that immediate area of London include the octagonal building in New Fetter Lane itself, once the home of Robert Maxwell's Mirror Group Newspapers - that has an astroturf covered roof with an (H). It is still in occasional use
Also, only 150m east of that one is the International Press Centre where they used (in pre www days..) fly publishing plates north for the Manchester editions of the Daily Mail. In more recent years (c 1995) there was a Barclaycard advert filmed on that roof with Rowan Atkinson!
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