Liz Truss was told of the Queen's condition before she delivered a speech on Thursday on freezing energy prices for two years.
Footage emerged of the Chancellor of the Duchy of Lancaster Nadhim Zahawi informing the Prime Minister shortly after noon that the monarch was gravely ill.
It has now emerged Truss was briefed on events before she arrived in the House of Commons to deliver the speech which will save the typical household £1000-a-year.
