This morning I was idly recording close-up clips of flags fluttering in the sunshine outside Parliament, filler material for other videos, when I heard the angry Brexiter start shouting. Maybe some words had already been exchanged between them, but I think he had recognised the elderly former Conservative MP John Gummer and was directing his rant at him. And then a passerby intervened…..

Since when did taunting frail old men belong in British politics?