The Queen who was the oldest serving monarch died peacefully on September 8 at the age of 96 at the Balmoral Castle.
Following the death of the Queen, new coins and notes bearing the image of King Charles III are likely to soon be issued.
The royal family is working on a number of adjustments to the programme, she said, without revealing the changes just yet.
Premier League matches slated for the weekend have been postponed.
“World has known only one queen, and the passing of Queen Elizabeth II will be the end of an impactful reign.”
“Her late Majesty was the only British Sovereign known to 90 per cent of our population,” said Mr Buhari.
He will be addressed as the King of United Kingdom and the 14 Commonwealth Realms.
The UN chief said Queen Elizabeth II was a good friend of the United Nations, and visited the New York Headquarters twice.
Ms Truss is expected to make her first speech as Prime Minister outside 10 Downing Street at about 4:00 p.m. today.
