First minister of Wales, Mark Drakeford, and Scotland's deputy first minister, Shona Robinson, will be among the Celtic leaders in attendance at the first meeting of its kind.

Whether there is a Brexit deal or not, the Scottish and UK governments are heading into another constitutional standoff with legislation to set up an "internal market" passing through Westminster. What is the latest row all about?

Fishing has been one of the key sticking points in talks over a future UK/EU trade deal.