Brexit: What is Tuesday's Article 50 Supreme Court Case about?

The highest court in the UK will on Tuesday rule on what has been described as a "historic legal battle".

Theresa May will learn whether she has to ask MPs and the devolved governments of Northern Ireland and Scotland before she can officially begin EU divorce proceedings by triggering Article 50.

This, in a nutshell, is what the case is all about.

:: 11 Supreme Court judges will decide whether the High Court was right to order the Prime Minister to let MPs vote on triggering Article 50 - the mechanism that sets off EU divorce proceedings

:: They will also decide whether the devolved governments of Northern Ireland and Scotland should have a say too

:: The High Court ruled in November Mrs May must put the vote on triggering Article 50 to Parliament

:: Northern Ireland and Scotland added their arguments when the case reached the Supreme Court

:: The case was originally brought by pro-Remain fund manager Gina Miller and Portuguese hairdresser and Leave supporter Dier Dos Santos

:: A five-minute ruling will be given on Tuesday, 24 January - the four-day hearing was in December

:: It is widely expected the judges will rule the High Court was right and Mrs May must put triggering Article 50 to the vote

:: The Government is privately more confident the court will not rule the matter must go to Northern Ireland and Scotland

:: MPs have already said that in principle they will vote to set off Article 50

:: The Government has prepared two bills to put before Parliament - one is just two lines long

:: Remain MPs have said they want to see the Brexit negotiation strategy in the bill before they will vote on it, which could mean Mrs May will not meet her end of March Article 50 deadline