Anthony Seldon’s latest book is not for the faint-hearted. Those who feel compelled to read his account of Liz Truss’s 49 days in Downing Street in 2022 – and I am not sure how numerous outside Westminster they will be – should prepare to feel traumatised. Over 365 pages it becomes clear that the chaos, self-regard and detachment from reality apparent from the outside is not only confirmed by accounts from “inside the room” but was probably even…