London media law firm Mishcon de Reya announced on its blog that it would bring a legal challenge on behalf of several clients to challenge whether the British executive can unilaterally invoke Article 50 of the Treaty of European Union (EU) beginning its EU withdrawal process, or whether Parliament needs to be consulted.

Mishcon partner Kasra Nouroozi said:

We must ensure that the Government follows the correct process to have legal certainty and protect the UK Constitution and the sovereignty of Parliament in these unprecedented circumstances. The result of the Referendum is not in doubt, but we need a process that follows UK law to enact it. The outcome of the Referendum itself is not legally binding and for the current or future Prime Minister to invoke Article 50 without the approval of Parliament is unlawful.

We must make sure this is done properly for the benefit of all UK citizens. Article 50 simply cannot be invoked without a full debate and vote in Parliament. Everyone in Britain needs the Government to apply the correct constitutional process and allow Parliament to fulfil its democratic duty which is to take into account the results of the Referendum along with other factors and make the ultimate decision.