Other EU countries have flexible legal arrangements for their own special territories – something similar for Northern Ireland is not impossible.
A conciliatory tone from the prime minister but Boris Johnson and Michael Gove continue to cause problems.
Options to avoid a hard border are on the table, but they remain unpalatable to Theresa May's government.
The Labour leader's vision for a customs union after Brexit is even more optimistic than the one being proposed by Theresa May.
Leaving the EU single market and customs union cannot be compensated for by free trade agreements with other countries.
The leaked government Brexit report reinforces the academic consensus that the harder the Brexit, the worse it will be for the UK economy.
After decades of diplomacy and development the two economies of Ireland are more integrated than they have been in a century.
Any Brexit that takes Northern Ireland out of the customs union will have a significant impact.
Unpicking why Labour has shifted its Brexit strategy to push for single market membership during a transitional period.