http://thenextweb.com/uk/2011/08/01/facebook-secures-new-off...
(I'm an American who works off Carnaby)
I can probably see your flat from my offices front door. I work next to Le Pain (not the hotel but, you can guess pretty easily)
Is there a London HN or a (SOHO London HN Meeting)?
There is a London HN meetup, one of my friends runs it.
Drop me a line: stevie <-AT-> twilio.com
http://arifdurrani.mediaweek.co.uk/2012/04/25/inside-faceboo...
London is massive, and there are certain areas that tech/digital people want to work in. Covent Garden - probably yes. Shoreditch - yes. I think Twitter ended up somewhere near Blackfriars which is just full of legal suit drones.
If you're opening an office in London, and you've done your research, you need to PR the hell out of the location!
As for the article, it is just not very thorough. See this comment for location and link to article about it. Its a high budget office. http://news.ycombinator.com/item?id=4289895
Re: Blackfriars - it's not a totally nuts location for a mobile engineering team, because it's where Symbian's offices are/were. Lot of mobile engineering talent already commuting to the area.