Finally (one hopes) deliver as much corroborative material as possible to our tiny HSBC branch at Charing Cross where we are now on first name terms with the affable Hassan, who probably hopes that his friendly "see you" as we're leaving is inaccurate. Photograph the pedestrian crossing light at Trafalgar Square. We cross when it's green but can't imagine what the code is. Green light for ménage à trois?