Israel's Prime Minister Benjamin Netanyahu has prepared the country for a long wait in the search for three teenagers who disappeared last week.
Israel believes they were kidnapped by Hamas militants - and have arrested more than 100 of them - but without uncovering any clues.
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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.