No Californian could have painted Hockney’s pools. No La-La Land artist, raised on sun and orange juice, would have done tiles and diving boards and tan-lined bottoms as the boy from Bradford did.

It had to be a Hockney, brought up, the fourth of five children, in a two-up two-down. Hockney, who aged three had sheltered from bombs with his mother Laura, father Kenneth, four siblings and a lady neighbour in the cupboard under the stairs.