 Elizabeth grew camellias in every one of her gardens , and before her flag @-@ draped coffin was taken from Windsor to lie in state at Westminster Hall , an arrangement of camellias from her own gardens was placed on top . More than 200 @,@ 000 people over three days filed past as she lay in state in Westminster Hall at the Palace of Westminster . Members of the household cavalry and other branches of the armed forces stood guard at the four corners of the catafalque . At one point , her four grandsons Prince Charles , Prince Andrew , Prince Edward and Viscount Linley mounted the guard as a mark of respect known as the Vigil of the Princes — an honour bestowed only once before , at the lying in state of King George V. 
