In recent weeks whenever I have switched on the TV news bulletins I seem to have been greeted by the sight of the imposing black door at No 10 Downing Street. It must be the most photographed door in history.
I remember as a child in the late 1950s walking along Downing Street with my mother past that door with a policeman standing stoically on the doorstep appearing to be the only security presence. No, they didn't let us in.
Times have changed of course and the general public have not been able to stroll down that street for many years for obvious security reasons.
