When the Prime Minister cannot be bothered to listen to the Budget it sends out a pretty big signal to the country that there’s nothing much in it. Rishi Sunak spent long chunks of Jeremy Hunt’s latest financial statement on Wednesday chatting away to Treasury Chief Secretary Laura Trott. It was a wholesome scene reminiscent of one of those joint social evenings that neighbouring boys’ and girls’ schools in pleasant Home Counties towns sometimes put on for their sixth-formers.