Queen Elizabeth. Pic/AFP

Prime Minister David Cameron will lead tributes in the House of Commons and there will be a River Thames salute.

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The exact moment the Queen reaches the milestone is not known because her father, George VI, passed away in the early hours of February 6, 1952.

On the Thames, a flotilla of historic vessels, leisure cruisers and passenger boats will take part in a procession between Tower Bridge and the Houses of Parliament.

The bridge will lift as a sign of respect and H.M.S Belfast will sound a four-gun salute.

The BT Tower in central London will scroll the message 'long may she reign'.

She has let it be known that she does not want a fuss to be made. It is evidently viewed as bad form for one long-lived queen to be celebrating the passing of a record set by another long-lived queen.

The prime minister's official spokeswoman said David Cameron had paid tribute to the Queen at a cabinet meeting on Monday.

He said the Queen had a 'remarkable record' and was 'a symbol of Britain's enduring spirit admired around the world'.

Queen Elizabeth's reign has included 12 prime ministers, two more than served under Victoria.