A special Commons sitting was due to start at midday and go on until around 10pm for MPs to remember the late monarch. The House will sit tomrorow, from 2pm, when MPs will start taking the oath to the King.
All other parliamentary business will be postponed until after September 21.
But the Government is pressing ahead with key policies such as delivering the energy plan by October to limit gas and 2 electricity bills this winter. Ms Truss, pictured, became the 15th Prime Minister during the Queen's reign at a "kissing hands" ceremony at Balmoral Castle on Tuesday.
The Queen succeeded to the throne in 1952, when Winston Churchill was Prime Minister. Anthony Eden was the first Prime Minister appointed by Her Majesty, in 1955.
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