Gina Miller's legal representatives are outlining the case against the Government in day three of the four day Supreme Court appeal on Brexit.
Lord Pannick QC is representing Ms Miller and will tell the court Theresa May does not have sufficient authority to trigger Article 50 and instead the case must go to MPs.
Yesterday, while the court was sitting, Ms May announced during a visit to the Gulf that she will reveal her Brexit plans before triggering Article 50, in what appears to be a signifcant U-turn on her previous position.
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The Prime Minister has previously said she plans to trigger Article 50 by the end of this Spring.
If MPs are entitled to vote on Article 50, it could delay Brexit considerably or ensure it is a 'soft Brexit' rather than a 'hard Brexit' as politicians could insist protectionist clauses are inserted before EU withdrawal.
The Supreme Court case is expected to last four days.
A judgment is anticipated for early in the new year.
