A pictorial from the
BBC» showing changes to King's Cross' fa^ade through the years and commenting on the removal of the 1973 concourse:
Christmas Day - when there are no trains running and therefore no passengers - has been chosen as the moment when the last section of King's Cross Station's 1973 fa^ade will be demolished. It marks the start of the last phase of development which will give the station a public square for the first time in its 160-year history.
The 1973 extension was built to contain the main passenger concourse and ticket office. Although intended to be temporary, it has stood for 40 years. The fa^ade was given a paint job in the summer ahead of the Olympic Games.
http://www.bbc.co.uk/news/uk-england-london-20771255