Monuments to past heroes become in time posterity’s reminders to historic and imperial mindsets which most of us have outlived; pigeons that there perch have long had a more consistent attitude.

The enthusiasm for statues tells us as much about their supporters as those celebrated; blue plaques, however, are cheaper, easier to clean, and both more discreet and informative.

Who today can readily recall the names and exploits of the plinthed warriors surrounding Nelson’s column?