Andrew Gilligan is a writer and former No10 adviser. Surely the Tories must now start – for the first time in years – to take London seriously? In particular, please can the party this summer pull its finger out and select – again, for the first time in years – a front-rank, heavyweight candidate for Mayor. It could be the most important single thing Kemi Badenoch can do to improve Conservative fortunes in this parliamentary term. Last week, ami…