Post-Brexit, UK is now reliant on EU goodwill for its security

The UK-EU Trade and Cooperation Agreement (TCA), contains substantial provisions for internal security cooperation, including on police and judicial matters. However, the TCA represents a "security downgrade" especially for the UK, even if the agreement did not cross any of the UK's red lines.

The first threat to the British internal security relates to issues in Northern Ireland.

The UK an...