The Prime Minister and US President Barack Obama have discussed intelligence-gathering techniques in a phone conversation this afternoon.
Finally, the President updated the Prime Minister on the US signals intelligence review ahead of setting out tomorrow his Administration’s response to the review.
The two leaders welcomed the unique intelligence sharing relationship between their two countries.
The two leaders also discussed the progress made in destroying the Syrian government's chemical weapons stockpile and the need for a political solution to the conflict.
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A chilly night with widespread frost and fog in some parts of the UK which will be slow to lift in the morning.