It's been out of the headlines for the past few months, but Brexit is back on the political menu.
EU Customs Union
Here's Boris Johnson saying he would prefer to reach a Canada-style agreement with the EU in upcoming trade negotiations.
Under the existing EU-Canada trade deal, import tariffs on most goods have been eliminated between the two countries, though there are still customs and VAT checks.
The flow of services, such as banking - which is much more important for the UK - between Canada and the EU are much more restricted.
In his speech earlier in London, the prime minister insisted that the UK would "still prosper" if the two sides failed to reach an agreement and their future trade was governed by World Trade Organisation rules.
At 23:00 tonight the UK, including Northern Ireland, will legally leave the EU.
What are the implications for Northern Ireland?
The UK will no longer be represented in EU institutions and Northern Ireland's three MEPs will no longer sit in the European Parliament.
Brexit will be "done" but there will be little practical impact as a transition period begins.