File photo dated 13/7/18 of Queen Elizabeth II, US President Donald Trump and first lady Melania Trump walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor. Policing Trump's four-day visit to the UK cost more than �14.2 million, according to figures obtained by the Press Association.
US President Donald Trump and first lady Melania Trump with Queen Elizabeth II in the Quadrangle at Windsor Castle, Windsor.
US President Donald Trump and first lady Melania Trump are greeted by Queen Elizabeth II as they arrive at Windsor Castle, Windsor.
US President Donald Trump and Queen Elizabeth II walk in the Quadrangle at Windsor Castle, Windsor.
Queen Elizabeth II and Lieutenant Colonel Sir Andrew Ford walk in the Quadrangle at Windsor Castle, Windsor ahead of a ceremonial welcome for US President Donald Trump.
US President Donald Trump and Queen Elizabeth II inspect a Guard of Honour, formed of the Coldstream Guards, at Windsor Castle, Windsor.
US first lady Melania Trump and Lieutenant Colonel Sir Andrew Ford walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II and US President Donald Trump walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
US President Donald Trump and first lady Melania Trump with Queen Elizabeth II in the Quadrangle at Windsor Castle, Windsor.
Queen Elizabeth II and US President Donald Trump walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II, US President Donald Trump, first lady Melania Trump and Lieutenant Colonel Sir Andrew Ford walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
US President Donald Trump and Queen Elizabeth II inspect a Guard of Honour, formed of the Coldstream Guards, at Windsor Castle, Windsor.
US President Donald Trump and first lady Melania Trump are greeted by Queen Elizabeth II as they arrive at Windsor Castle, Windsor.
Queen Elizabeth II, US President Donald Trump and first lady Melania Trump walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II and US President Donald Trump walk in the Quadrangle during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II, US President Donald Trump and first lady Melania Trump during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II and US President Donald Trump look on as soldiers from the Coldstream Guards march past during a ceremonial welcome at Windsor Castle, Windsor.
Queen Elizabeth II, US President Donald Trump and his wife Melania walk from the Quadrangle after inspecting an honour guard at Windsor Castle, Windsor.