It was Cop26 in Glasgow and Nicola Sturgeon was in her element, posing for selfies with Greta Thunberg, David Attenborough and assorted world leaders. The then first minister was desperate to upstage Boris Johnson who had very much put his mark on the global climate shindig. ‘It’s one minute to midnight on the Doomsday clock,’ the prime minister warned the assembled green lobbyists and corporate CEOs, ‘and we need to act now’. He