https://www.bbc.co.uk/news/uk-northern-ireland-66971372
[EXTRACT]
A key part of the Windsor Framework has been implemented with the start of a new system for moving goods from Great Britain to Northern Ireland.
The framework, which was agreed by the EU and UK in February, is the revised post-Brexit deal for Northern Ireland.
It is intended to ease trade between Northern Ireland and the rest of the UK.
The most visible change will be 'Not for EU' labelling appearing on some food products in NI shops.
That labelling change is due to be rolled out across the rest of the UK next year.
Northern Ireland Secretary Chris Heaton-Harris said the new system would mean "the substantial majority" of trade from GB to NI will be "treated as UK internal trade".