The Supreme Court has ruled that the devolved Scottish and Welsh governments have the right to intervene in the legal battle surrounding Article 50.
The Independent Workers Union of Great Britain and the 'expat interveners', a group representating British nationals living abroad, have also been granted the right of involvement in the Government's legal challenge to the High Court ruling passed earlier this month, which decreed that Theresa May cannot trigger Article 50 without the consent of parliament.
In their submissions, the Scottish and Welsh governments will be able to reference their own national legal systems and raise any perceived inconsistencies with the Government's wish to trigger Article 50 without MPs' consent.
The Scottish National Party (SNP), Scotland's dominant party which won 56 seats at Westminster in the 2015 election, has been particularly critical of the June 23 referendum which led to Brexit, pointing out that a majority of people in Scotland voted to remain in the UK.
Nicola Sturgeon, the SNP leader, has suggested the Scottish people have been effectively disenfranchised by the Brexit vote and claimed it provides grounds for a second Scottish independence referendum.