A conspiratorial group of extreme Brexit lobbyists mounted an extraordinary campaign against one of the world’s most prestigious science journals – part of a series of joint investigations between Byline Times and Computer Weekly.

PM urged to recognise pursuit of no-deal Brexit would be regarded as serious error by US.

Former security commissioner warns of ‘immediate impact’ on tackling terrorism and crime.

Cooperation vital in the face of twin threats posed by Isis and Russia, warns Andrew Parker

A row has broken out over the publication of an intelligence report into Russian covert actions in the UK, with critics saying Downing Street is stalling on its release until after the election.

'We would have to start again with a blank sheet of paper as to how we build up that cooperation with our European partners'

Sir John Sawers says it would be hugely damaging if UK-EU relations collapsed to such an extent.

'It is not surprising that the people who have devoted themselves to serving the interests of this country are concerned about the direction in which the country is going'. / In an outspoken intervention, Sir John Sawers said it was "unwise" to hold a referendum in the first place and warned that political turmoil had damaged the UK's standing on the world stage.

The former head of MI6 says any Brexit makes security difficult to manage but "the harder the Brexit, the greater the damage". / The blunt warning comes from three men who have served at the very top of the British defence and security ...

The former head of MI6 has warned Theresa May’s Brexit deal will “threaten the national security of the country”, in a call for Tory MPs to reject it. The agreement would “place control of aspects of our national security in foreign hands”, claims Sir Richard Dearlove, in an extraordinary letter to Conservative associations.