London Pics
Red Bus stop sign chronology.
29 October 2013 - City of Westminster approved changes to bus stand and approved changes to flags in the vicinity of location of Q pic Fsurv_londonps1.
December 2013 - Planned start of demolition / construction of Communications House, 48 Leicester Square, Westminster, UK.
23 March 2014 - Outside work began on demolition / construction.
July 2012 Street View image of bus sign shows it was different than the bus sign that appeared in Q's pic of Red Bus.
May 2014 Street View image of bus sign indicates it was the same as the bus sign that appeared in Red Bus pic.
December 2013 to 2016 - Renovation of 48 Leicester Square planned for two year period.
Based on this evidence, the Red Bus pic was taken some time between 29 October 2013 (when changes were approved for the bus stand and its sign) and 23 March 2014 (when news photo showed work had begun on the exterior of 48 Leicester Square).
Given the winter jackets and hats displayed in the Red Bus pic, the pic was taken some time during the winter months of November-December 2013 and January-February-March 2014. There is some pictorial evidence that people wore winter jackets and hats during April 2014, also.