The announcement will escalate fears about the monarch’s health. She left a remote secret council yesterday after doctors ordered her to rest. “Following further assessment this morning, the Queen’s doctors are concerned about Her Majesty’s health and have advised her to remain under medical observation,” the palace said. “The Queen remains comfortable at Balmoral too.” A spokesman for the Queen suggested the advice to rest was the result of her “busy day” on Tuesday, when she accepted Boris Johnson’s resignation as Prime Minister and received Liz.