"In this photograph, the taxi has driven beyond the first stop line and into the advanced stop box reserved for use by cyclists, and is breaking the law (unless the vehicle was so close to the first stop line when the lights changed that it would have been unsafe to stop)."
Oh hippy.. you fell for my trap setup & written in the finest of legal-ease.
Yes its ilegal to 'Drive' into a stopbox without due reason.
But its not ilegal to 'be' in a stopbox - because as stated it might have been unsafe to stop outside it.
you'll enjoy this
http://www.guardian.co.uk/environment/2010/jul/29/cycling-advance-stop-line