The UK government is reportedly facing a new legal battle over Brexit. The dispute is over whether Britain stays inside the EU's single-market after it splits from the bloc, which is expected around 2019.

Lawyers are apparently preparing to challenge Theresa May's administration over the view that the UK's membership of the European Economic Area (EEA) ends when Britain breaks from the EU, the BBC reported.

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The case could eventually see MPs given a vote over whether the UK stays inside the EEA or not.

The pro-single-market British Influence think-tank is expected to write to David Davis to inform the Brexit secretary that the group will seek a judicial review of the government's position.

"As the UK is party to the EEA agreement only in its capacity as an EU member state, once we leave the EU we will automatically cease to be a member of the EEA," a government spokesperson said.

"The future relationship between the UK and the EU will be subject to negotiations. It's not in the UK's interest to give a running commentary on our thinking that could undermine our negotiating position. The referendum result will be respected and we intend to invoke Article 50 no later than the end of March [2017]."

The development comes after the High Court dealt a blow to May's Brexit plans by ruling that MPs should have a vote on triggering Article 50 of the Lisbon Treaty, the official mechanism to split from the EU.

The government is contesting the decision at the Supreme Court from 5 December, with a ruling expecting in January 2017. Interim Ukip leader Nigel Farage had planned to lead a mass pro-Brexit demonstration on the court, but IBTimes UK revealed that the protest had been called.

The event's organiser, campaign group Leave.EU, "postponed" the demonstration over fears far-right organisations such as the English Defence League and the British National Party would "hijack" the protest.

May has promised to trigger Article 50 by March 2017 ahead of general elections in France and Germany.

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