Technology giant Apple is "very optimistic" about the UK's future post-Brexit, its boss has told the prime minister.

Apple's chief executive Tim Cook met Theresa May at Downing Street and said he thought the UK would be "just fine"' outside the European Union.

The company plans to build a new UK headquarters in London.

It has thousands of members in the US, including many large multinationals.

Its head of international affairs, Myron Brilliant, told the BBC firms were worried about future trade rules.

He said they thought there could be new regulatory challenges once the UK was no longer in the EU.

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