People take part in A March for Europe from Park Lane to Parliament Square in Westminster, central London, Britain, 02 July 2016. Thousands of people wishing Britain to remain a member of the EU have joined the 'March for Europe' rally, which was organised on social media.

Several thousands demonstrators took to the streets of London on Saturday in protest against Britain's recent vote to leave the European Union.

Protestors demanded that the government reconsider the outcome of the recent referendum, in which 51.8 per cent of British people voted for a Brexit, or British exit from the bloc.

A BBC reporter at the scene estimated that around 40,000 people, predominantly youth, had come out for the march.

Britain's young people were left largely disappointed by the referendum outcome, with around 73 per cent of young voters favouring to stay in the EU, compared with some 43 per cent of people over 45 years old, according to pollster Lord Ashcroft.

Meanwhile, 4 million Britons have signed an online petition calling for a repeat of the in-out referendum.

The demonstrations came as Queen Elizabeth II called for Britons to remain "calm and collected" in addressing today's challenges and opportunities, as she spoke during a ceremony for the newly elected Scottish parliament.

The 90-year-old monarch, who typically avoids voicing her opinion on British political issues, did not specifically mention Britain's EU membership.

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