A suspected gunman who killed six people in a shooting rampage in Santa Barbara, apparently killed himself, the sheriff said in a press conference.
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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.