Invoking Article 50 of the Treaty of the European Union requires participation of the UK Parliament say Lord Chief Justices Lord Sales and Lord Thomas of the Royal Courts of Justice in London who handed down their judgment today.

This is a significant step, but only a step along the way. The final outcome remains uncertain as this judgment will most likely be appealed by the Government to the Supreme Court. Hence, the uncertainty caused by Brexit to businesses remains if it is not further increased.

The summary conclusion reads as follows:

“The court does not accept the argument put forward by the Government. There is nothing in the text of the 1972 Act to support it. In the judgment of the court the argument is contrary both to the language used by Parliament in the 1972 Act and to the fundamental constitutional principles of the sovereignty of Parliament and the absence of any entitlement on the part of the Crown to change domestic law by the exercise of its prerogative powers. The court expressly accepts the principal argument of the claimants.

For the reasons set out in the judgment, we decide that the Government does not have power under the Crown’s prerogative to give notice pursuant to Article 50 for the UK to withdraw from the European Union.”