That is the voice of Elizabeth II, who has been since her accession in 1952, Queen of the United Kingdom, Canada, Australia, and New Zealand, and Head of the Commonwealth.
On 9 July 1998 President Nelson Mandela visited England. On 12 July 1998 he concluded his four-day visit to England by accompanying Queen Elizabeth II on a coach drive through the streets of London. Mandela had stayed at the Buckingham Palace as an honored guest of the Queen and addressed a joint meeting of Parliament at a packed Westminster Hall. In a BBC documentary, Mandela repeatedly referred to Queen Elizabeth II as "my friend, Elizabeth".