Guido will spare his blushes by not naming the PM’s key aide who turned up at a Buckingham Palace dinner straight from the office. He immediately realised he’d failed to read the invitation as he joined the other guests who were dressed for dinner in black-tie. To his relief he spotted someone else also in a suit, but at that very moment Prince Philip walked in and turned to the incorrectly dressed pair. The adviser tried to make light of his sartorial mistake, at which point Prince Philip boomed, “Who the bloody hell comes to dinner in a suit?” Before an aide diplomatically shuffled the Prince on…