Nothing new here then. Murals and adaptions to buildings like this go up all over the place generally with council consent e.g. :-
http://www.hastingsforum.net/cgi-bin/simpleforum_pro.cgi?fid=03&topic_id=1281724579
http://astro.imperial.ac.uk/~gbendo/Pict/UKg/Lon/Cam/ukg_lon_cam4c01.jpg
http://www.urban75.org/london/images/camden-08.jpg
http://www.hastingsforum.net/cgi-bin/simpleforum_pro.cgi?fid=03&topic_id=1281724579
http://astro.imperial.ac.uk/~gbendo/Pict/UKg/Lon/Cam/ukg_lon_cam4c01.jpg
http://www.urban75.org/london/images/camden-08.jpg