I do not get out very much these days, but the glorious weekend weather persuaded me that I should spend a pleasant afternoon watching people stabbing each other at our annual celebration of stabbing, the Notting Hill Carnival. I go most years and enjoy the street food, the music and the sight of white police officers with fixed rictus grins ‘getting down’ with some vast-mammaried semi-clad mama, their helmets askew and rivulets of sweat running down each crisp white shirt.