Audience at Buckingham Palace. Queen Elizabeth II receives Mr Isselkou Izid Bin Neye the Ambassador of Mauritiania and Mrs Mariem Sidi Bouna, after he presented his credentials during a private audience at Buckingham Palace, central London. Picture by i-Images / Pool / eyevine

Audience at Buckingham Palace. Queen Elizabeth II with Mr Isselkou Izid Bin Neye the Ambassador of Mauritiania, as he presents his credentials during a private audience at Buckingham Palace, central London. Picture by i-Images / Pool / eyevine

Audience at Buckingham Palace. Queen Elizabeth II shakes hands with Mr Fred Arruda the Ambassador of Brazil, before he presented his credentials during a private audience at Buckingham Palace, central London. Picture by i-Images / Pool / eyevine

Image ?Licensed to i-Images Picture Agency. 19/02/2019. London, United Kingdom. Audience at Buckingham Palace. Queen Elizabeth II shakes hands with Mr Fred Arruda the Ambassador of Brazil, before he presented his credentials during a private audience at Buckingham Palace, central London. Picture by i-Images / Pool

Image ?Licensed to i-Images Picture Agency. 19/02/2019. London, United Kingdom. Audience at Buckingham Palace. Queen Elizabeth II with Mr Fred Arruda the Ambassador of Brazil and wife Mrs Lenice de Almeida Nobrega Arruda, after he presented his credentials during a private audience at Buckingham Palace, central London. Picture by i-Images / Pool