South African presidency spokesman Mac Maharaj has spoken about Nelson Mandela's condition after he was admitted to hospital after an recurrence of a lung infection.
He said with a person of Mr Mandela's age "there always has to be concern and therefore the doctors would prefer to work on the side of caution rather than take any risks".
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The figure is up from £42.3 million in 2014/15 and £56.9 million 2015/16, according to the research.
A study by Which? looked at the work done by councils across the country.
Harry first visited the African country in 2004 on a gap year.