BBC News
By Emma Vardy
image captionThe Northern Ireland Protocol is opposed by unionist parties which see it as undermining their place in the UK
It is now three months on since the UK s separation from the EU and the greatest tension in that time has been over the creation of a brand new border within the UK - the Irish Sea border.
It is part of the Northern Ireland Protocol - a contentious aspect of the Brexit deal, which introduced checks on goods crossing the Irish Sea as a compromise in order to avoid checks on the land border with the Republic of Ireland.
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