Lead claimant in the Article 50 case, Gina Miller arrives at the Supreme Court in London (EPA)

The Government's Brexit plans are so flawed "even a six year old child could see it", the Supreme Court has been told.

The claims were made by Richard Gordon QC, Law Officer of the Welsh Government, who told the court Welsh politicians should be allowed to approve plans to trigger Article 50.

The Supreme Court was hearing final arguments in the Brexit legal challenge as the case entered its fourth and final day.

Opponents to the Government's Brexit plans outlined their case; with representatives of Wales, Scotland, ex-pats and children's rights putting their case to judges.

The Government's lawyers then had their final opportunity to refute the claims and make their case that Theresa May has sufficient authority to trigger Article 50 without a vote from MPs. The argued the 2015 Referendum Act which outlined the terms of the EU referendum did not specify who could trigger Article 50.

Latest updates:

Please wait a moment for the live blog to load:

All 11 of the Supreme Court justices, who are the most senior judges in the UK, heard the case and have now retired to reach their decision.

A judgment is expected to be announced early in the new year.