The EU has ruled out any cherry picking from the UK for things like single market access for financial services.
Other EU countries have flexible legal arrangements for their own special territories – something similar for Northern Ireland is not impossible.
Leaving the EU single market and customs union cannot be compensated for by free trade agreements with other countries.
Nissan might have promised post-Brexit investment, but leaving the single market and customs union could change everything for the UK.
The DUP should take note: free travel and trade between Northern Ireland and the Republic may hinge on legal arrangements.
The French president has a vision for a more integrated Europe – and Brexit feeds right into that.
After decades of diplomacy and development the two economies of Ireland are more integrated than they have been in a century.
Unpicking why Labour has shifted its Brexit strategy to push for single market membership during a transitional period.
A breakdown of the UK's position paper on the customs union.
Labour leader Jeremy Corbyn insists the two are inextricably linked. He's wrong.
What does his party stand for and what does it want to do about Brexit? Some big questions need answering, and fast.
A new survey suggests the British public are most in favour of a Norway-style deal with the EU.
The Treaty of Rome, which eventually led to the European Union, is turning 60 at a time when many inside and outside Europe are questioning the union's value. For the U.S., much is at stake.
Negotiating trade deals is a tremendous task and requires clarity for each and every economic sector involved. Unfortunately, the White Paper offers little detail on this.
The UK's decision to leave the single market and customs union will have huge consequences.
London and Brussels should be constructive about Brexit – for both their financial benefit.
You might be familiar with Article 50, but Article 127 of another European treaty could be as important when it comes to Brexit.
It could even lead to a loss of low-skilled manufacturing jobs.
With patience and a degree of moral ambivalence, the UK may find an EU that is increasingly open to the idea of free trade without free movement of people.
The European Union faces a crisis of legitimacy, and its rules on fiscal governance are at the heart of it.