Intrastat guide issued by HMRC.
Remember the scope of the Intrastat for the UK will not disappear, but will reduce in scope:
- Till December 31, 2020: import from the EU into Great Britain (England, Scotland and Wales)
- Also after January 1, 2021: move between Northern Ireland and the EU
You’ll no longer need to submit a declaration for goods you export from Great Britain to the EU.
Source gov.uk