Should Just Stop Oil Just Stop Trying: how effective are “performance protests”, such as Just Stop Oil’s recent activities? By Kimberly Parry

The 17th century Rokeby Venus painting by Diego Velázquez has been damaged by two Just Stop Oil protesters in the National Gallery in London. Armed with hammers, the two students smashed the protective glass of the painting. The same painting suffered a slashing in 1914 by the suffragette and fine arts student Mary Richardson.