Former US defence secretary Robert Gates, who served under presidents George Bush and Barack Obama, focused on cuts to the UK Navy as particularly damaging. He said that for the first time since World War One, Britain did not have an operational aircraft carrier.
The Ministry of Defence has defended levels of spending within the military spending, and said that the UK had the best equipped and well trained armed forces outside of the US.
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The former prime minister suggested a Jeremy Corbyn government would be a 'very dangerous experiment'.
Schools in London, Brighton and Newcastle were among those closed after bogus security threats.
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