ENS is a notice that provides information about goods being imported into the UK. It's a pre-arrival notification that's required to assess security risks and ensure compliance with customs regulations.
The entry summary declaration will have safety and security information about your goods. Your entry summary declaration must be complete, accurate, and submitted before you arrive at the border.
The opposite of the EXS. The ENS alerts the import border of your imminent arrival. It isn't auto generated by another process as the import declaration, in many cases, can be done later whereas the ENS must be lodged at least 2 hours before you arrive at the border (one hour in the case of Eurotunnel).
Pre-arrival information required for safety and security purposes on imports. Information is used by the UKBF for cargo risk assessments and targeting purposes.