Brian Sewell does some donkey work: how Britain’s best-known art critic put his ass on the line

To the fantasy land of the Greens, where no promises are off the table — no matter how surreal. Just 48 hours after the Scottish branch embarrassed themselves over the Cass report, now it’s the turn of their London counterpart. Step forth Zoe Garbett, the party’s pink-haired nominee for the capital’s mayoralty, who is running