If you are in London over the coming weeks with a few hours to spare, that time would be well spent by taking a trip to a retrospective exhibition of the work of John Reardon, entitled (After) Whistlejacket, at the MMX Gallery. Reardon, who died in 2018, was a revered photographer and picture editor of the Observer, but this exhibition covers some of the work undertaken in the later years of his life when commissioned by his former colleague Jocelyn Targett to photograph the Darley stallions. This is stallion marketing reimagined. Reardon's...