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

As tensions escalate with Brussels, Julian Smith expresses alarm at anonymous Downing Street memo.

Move sparks fears PM will use European security as Brexit bargaining chip

Dover staff say move could compromise security and leave border without protection.

FORGET visas, cheap Europe trips and free trade. There is one fear that dwarfs all others for Australia, and it’s looking more likely as Brexit turns sour. / GLOBAL security, trade and the stability of the international system could take a body blow if Britain crashes out of the European Union (EU) in a bitter “no deal” scenario.

A leaked EU document lays bare for the first time the differences in how British nationals will be treated by the bloc’s member states after a no-deal Brexit, with two countries emphasising that requests to stay could be rejected on public order and security grounds.

Companies including Coca Cola, Norbrook Laboratories write open letter to British MPs.

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 ...

Transport body warns UK lorries would need counter-terrorism safety certificates.

Dozens of British security officials working at Europol will be ejected from the European crime-fighting agency in the event of a no-deal Brexit, putting thousands of criminal investigations in the UK at grave risk of collapse.

Losing access to European security arrangements post-Brexit "will only benefit criminals", Scotland's justice secretary has said.

Officer leading national preparations decries potential loss of EU crime-fighting tools.

London airport preparing for no deal by putting aside imported security materials.

It is "likely" the UK will leave Europol in the wake of Brexit unless a deal is made, the Home Secretary has said.

A leaked presentation, obtained by Sky News, warns of the impact of 'no-deal' on UK passengers travelling to and from Europe.

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.

Ex-Nato chief accuses ministers of ‘clumsy’ approach after letter triggering article 50 appeared to threaten defence cooperation

Prime minister’s remarks in article 50 letter prompt reply that other member states will not accept security collaboration as bargaining chip.