Lord Robin Janvrin, who served as private secretary to the sovereign from 1999 to 2007, will chair the newly established Queen Elizabeth Memorial Committee.

The committee will put forward proposals for a permanent memorial for the former monarch, as well as a national legacy programme.

The ideas will centre around Queen Elizabeth II's public service across her 70-year reign, as well as the causes she supported.

The committee will also engage with the public to bring in ideas and suggestions from across the UK.

Previous royal memorials include the statue of King George V opposite the Houses of Parliament and the memorial statue of King George VI on The Mall.

National legacy programmes for previous monarchs include the creation and protection of 506 parks, playing fields and green spaces in honour of King George V, and a bursary for youth leadership training to mark the life of King George VI.

The plans will be unveiled to coincide with what would have been Her Late Majesty's hundredth birthday year in 2026.

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The committee will be jointly supported by the Royal Household and the UK government - which will consider funding options as proposals develop.

A range of senior figures and experts will be appointed to develop ideas and bring recommendations to The King and the prime minister.

Lord Janvrin said: "It is an honour to be asked to chair the Queen Elizabeth Memorial Committee.

"It will be a unique challenge to try to capture for future generations Her Late Majesty's extraordinary contribution to our national life throughout her very long reign"

Deputy Prime Minister Oliver Dowden said: "Queen Elizabeth II was our longest reigning monarch and greatest public servant.

"Lord Janvrin will now begin the important work of designing a fitting tribute to her legacy of service to our nation and the Commonwealth."