On the assumption that the Burberry office is the same building is would have been less than 15 mins walk from the SIS HQ in Broadway and the building in the background here
https://www.google.co.uk/maps/@51.49...8i6656!6m1!1e1
is now the MI5 HQ.
I wonder if Horseferry House continued in use once KLM flights moved to Bristol from Croydon or Heston or wherever.