EXS - Exit Summary Declaration

If you're moving goods outside the UK, you'll need to make an exit summary declaration if you've not fulfilled safety and security requirements with a full customs export declaration.

Safety and security information must be provided for all export movements out of Great Britain (England, Scotland and Wales), unless they are going to Northern Ireland or are otherwise exempt.

There is a requirement to submit export information for some movements out of Northern Ireland, unless they are going to the EU.

See UK government guidance.