From the moment Donald Trump and his wife Melania arrived at Stansted Airport on Monday morning, the hours that have passed have been a whirlwind.

The US President is here for a three-day state visit which will see him undertake numerous engagements including a state banquet and paying tribute to the allied servicemen who took part in D-Day on the 75th anniversary of the landings.

US President Donald Trump and his wife Melania arrived at Stansted Airport. Credit: /Joe GiddensPA

A display of pomp and pageantry has greeted Mr Trump and his entourage from the moment Air Force One landed at Stansted Airport.

Mr Trump and the First Lady were greeted with a guard of honour by airmen from the RAF Regiment as they walked off Air Force One.

Mr Trump was greeted by a guard of honour at Stansted Airport. Credit: AP
Mr Trump waved to onlookers on his arrival. Credit: Joe Giddens/PA

However, as he landed, Mr Trump could not resist creating headlines in the UK by making offensive comments on Twitter about London Mayor Sadiq Khan, branding him a "stone cold loser".

In return the Mayor's office fired back, saying Mr Trump was offering "childish insults which should be beneath the President of the United States".

US flags decorated The Mall leading up to Buckingham Palace to mark the US President’s state visit. Credit: Steve Parsons/PA
US presidential helicopters made quite a sight as they passed the Queen Victoria Memorial outside Buckingham Palace. Credit: Gareth Fuller/PA

After disembarking Air Force One, the Trump's made their way by helicopter to Winfield House, the home of the US Ambassador to the UK, Woody Johnson.

A short time later, the US President and his entourage made their way to Buckingham Palace, again by helicopter, where they were welcomed by Prince Charles and the Duchess of Cornwall as they stepped off Marine One.

Mr and Mrs Trump later arrived in Marine One at Buckingham Palace. Credit: Toby Melville/PA
The Prince of Wales and the Duchess of Cornwall were there to meet them. Credit: Toby Melville/PA
Charles and Camilla greeted Mr Trump on his arrival in Marine One. Credit: Victoria Jones/PA
Charles chatted with the US President after his arrival at Buckingham Palace. Credit: Toby Melville/PA
The Duchess of Cornwall and Melania Trump both wore white. Credit: Toby Melville/PA

The pair were then taken to meet the Queen - their second introduction following Mr Trump's working visit to Britain last summer.

The monarch provided a warm greeting and shook hands with Mr Trump.

The Queen greeted the US President. Credit: Victoria Jones/PA
Mr Trump with The Queen. Credit: Yui Mok/PA
The group make their way into Buckingham Palace. Credit: Victoria Jones/PA

After meeting the Queen, Mr Trump was then invited by the Prince of Wales to inspect the Guard of Honour, who were wearing their famous scarlet tunics and bearskins.

Mr Trump inspects the Guard of Honour. Credit: Toby Melville/PA

While the US President and First Lady stood with the Queen, Prince Charles and Camilla as a band played both countries' national anthems, Mr Trump's entourage, which includes his daughter Ivanka and son-in-law Jared Kushner, watched from a balcony above.

Ivanka Trump and Jared Kushner, right, during the Ceremonial Welcome at Buckingham Palace Credit: Toby Melville/PA

However, not everyone was pleased to see Mr Trump.

Protesters outside the palace made their feelings towards the President known through placards.

One demonstrator was pictured dressed up as the Statue of Liberty carrying a sign that read: ''The statue of taking liberties''.

A protester made their feelings known outside the palace. Credit: Steve Parsons/PA

Not all those gathered outside Buckingham Palace were against the President, many were there to support him.

Mr Trump has proved to be divisive - although many outside Buckingham Palace were happy to cheer for him, there were many who were not best-pleased to see him. Credit: AP

A huge security operation is in place for the visit, with large areas around Buckingham Palace cordoned off, while police officers could also be seen standing on the roof.

Royal guards march down Birdcage Walk on route to Westminster Abbey, London, ahead of US President Donald Trump on day one of his three day state visit to the UK. Credit: PA

The President and his wife spent time in sombre reflection by the tomb of the unknown warrior as a choir performed behind them.

Mr Trump greeted and spoke briefly to some of the singers.

US President Donald Trump, accompanied by his wife Melania and the Duke of York, places a wreath on the Grave of the Unknown Warrior during a tour of Westminster Abbey in central London. Credit: PA

Shortly after lunch, Mr Trump, Melania, The Queen, Charles and Camilla embarked on a brief tour of the Picture Gallery to view items from The Royal Collection.

It contains world-famous and historically significant works of art, including paintings and miniatures, drawings and watercolours, prints and photographs, furniture, sculpture, jewellery, porcelain, clocks, and arms and armour.

Queen Elizabeth II with US President Donald Trump view a special exhibition in the Picture Gallery of items from The Royal Collection of historical significance to the US, following a private lunch at Buckingham Palace in London. Credit: PA

Charles and Camilla organised afternoon tea for Mr Trump and Melania at Clarence House which is a short distance from Buckingham Palace, in Westminster, London.

Today Clarence House is the official London residence of The Prince of Wales and The Duchess of Cornwall.

US President Donald Trump and his wife Melania (left) at Clarence House in London to take tea with the Prince of Wales and Duchess of Cornwall. Credit: PA