The Magna Carta 800th committee was behind many of the anniversary celebrations around the country.

Image source, British Library

They tweeted, external: "The @ABAesq #MagnaCarta Memorial has been rededicated. Here's to another 800 years of #Liberty!"

John Cooper QC tweets, external: "Politicians quoting Magna Carta is the equivalent of them kissing the baby during an election. #MagnaCarta"

Adrian Harms
BBC Surrey

See a video, external of the Red Arrows flypast which took place at 12:15 - marking the fact Magna Carta was sealed in Runnymede in 1215.

And then they were gone...

Earlier, David Cameron talked about the revolutionary impact of Magna Carta "altering forever the balance of power between the governed and the government".

Image source, AFP

He said down the years it had inspired fighters in the English Civil War, the Chartists, the Suffragettes, the founders of the first American states, Gandhi, Nelson Mandela and "anyone challenging injustice or checking arbitrary power".

Tanya Gupta
BBC News

In the lead-up to the celebrations, I went down to Runnymede meadow to try and find out why people were so surprised the site was still just a field.

At the memorial though, people seemed even more taken aback that the structure had been put up by the American Bar Association.

I've tried to provide a few insights.

Here's our first reply to the question - what does freedom mean to you?

Satch Norton says it is "the right to choose" whether or not to have fracking, fluoride in drinking water, industries that supply weapons to repressive regimes, British soldiers fighting in other countries, and the right to choose who sits in the House of Lords.

We want to hear what you think. Tweet @BBCSurrey, external or email us.

Hew Locke's artwork, The Jurors, featuring 12 chairs arranged in a square, was unveiled at Runnymede earlier.

"They are dare I say it, beautiful, complex, multi-layered, he says."It's a place for people to sit down and talk about ideas of justice," he said.

He wants people to go up to the chairs and explore the work. "It only works if you go and sit on them."

Geri Silverstone, from the National Trust, said Runnymede was a fantastic place and a wonderful landscape with views of Windsor Castle to Heathrow Terminal 5 from Coopers Hill.

"You've got old and new, you've got a river. It's a fantastic bit of Surrey that we're very proud to be associated with."

He said work to improve the site as a tourist destination was planned to continue beyond the 800th anniversary.

Adrian Harms
BBC Surrey

The formalities are over and its time for the picnics.

And the sun has come out for the celebrations too.

The Red Arrows are helping to mark the 800th anniversary with a series of flypasts.

They will be over Runnymede at 1215 BST and Lincoln Castle at 1503 BST.

Image source, Getty Images

According to Visit Lincoln, external, the city is the only place in the world where you can find an original copy of Magna Carta together with the Charter of the Forest.

Children at the event are getting interested in the suffragette movement and its links with Magna Carta.

Here are some pupils from the Hythe School with an effigy of Emmeline Pankhurst.

The charter has inspired political movements over the centuries - not least the suffragettes.

Research by Alexander Lock, external on the British Library, external website found that in 1915, suffragette Helena Normanton argued the disenfranchisement of women contravened Magna Carta clauses 39 and 40.

And there's more on women's rights - Magna Carta clause 8 dealt with the rights of widows.

Adrian Harms
BBC Surrey

The Magna Carta 800 anniversary events continue at Runnymede.

I found these guys listening intently to the speeches a short while ago.

Magna Carta famously dealt with the liberties of free men - and so we're asking what freedom means to you.

Tweet us @BBCSurrey, external or email us your comments. We'd love to know what you think.

Unofficial Magna Carta celebrations are also taking place today on Coopers Hill - by the inhabitants of Runnymede Eco-Village.

They are known as the Magna Carta squatters because of their proximity to the memorial.

They are facing eviction by landowners Orchid Runnymede - their hearing takes place at Guildford County Court later. We'll be bringing you the outcome here.

Professor Justin Fisher from Brunel University has put together an exhibition at Runnymede, external looking at the influence of Magna Carta.

He says the document inspired the Bill of Rights of 1689 in Britain, the Declaration of the Rights of Man and the Citizen of 1789 in France, and the Bill of Rights in the US in 1791.

Image source, PA

He was in the second row for today's celebrations. Earlier, he tweeted, external that he would be presented to the royal party afterwards.

An update on the Magna Carta celebrations from Get Surrey.

Image source, Get Surrey

Eleanor Surrey Ad tweets, external: "The U.S. Attorney General is speaking at the memorial. I am proud, I am honoured and I am humbled."

See Get Surrey's live feed here, external.

David Cameron called for fundamental reforms to UK human rights laws to "safeguard the legacy" of Magna Carta at today's ceremony.

He said the principle of Magna Carta was "as relevant today as it was then" but the notion of human rights in Britain had been "distorted and devalued".

The Conservative government wants to scrap the Human Rights Act and assert the supremacy of the UK's supreme court over the European Court of Justice in Strasbourg.

Karen Shakespeare has come up with another Magna Carta joke.

She tweeted, external: "Where did King John sign the #MagnaCarta? At the bottom. #crackerjoke"

Twitter has seen a deluge of Magna Carta comments during the ceremony. Some have been light hearted and others more serious.

One human rights activist wrote they felt elated to be alive to see this moment, external.

Adrian Harms
BBC Surrey

The Queen has left the ceremony at Runnymede. The royal car was surrounded by crowds of people as it drove from the meadow.

Earlier, Her Majesty met people attending the celebrations. Thousands of people were there and a few lucky guests had the chance to meet her.