British Prime Minister Theresa May has told the European Commission President that her timetable for leaving the EU is still on track.

She made the statement in a phone call to Jean-Claude Juncker this morning.

It follows yesterday's decision by the British High Court that parliament should have a say in the triggering of Article 50 - the formal mechanism for exiting the EU.

In what was described as a short phone call, Ms May told Mr Juncker that yesterday's ruling does not change anything.

Ms May's spokesperson said: "The PM explained to both Chancellor Merkel and President Juncker that while the government was disappointed with the judgment, it had strong legal arguments ahead of the case moving to the Supreme Court.

"The PM also confirmed that the Government's planned timetable for notification of Article 50 remains unchanged."

The court ruled that power for triggering the exit process from the EU does not rest solely with the prime minister but should be put before parliament.

A government spokesperson this morning said Ms May remains confident of winning an appeal against that decision. The appeal will be heard next month.

Ms May also spoke this morning to German Chancellor Angela Merkel, and is due to speak to the French president and the European Council president later today.

However, as Ms May was smoothing diplomatic waters she faced other problems at home with the resignation of one her party MPs.

Stephen Phillips quit over what he described as irreconcilable policy differences with the government since the Brexit vote.

He is the second Tory MP to resign in less than two weeks, eating into a slim government majority.

The European Commission made no comment on the question of whether or not the prime minister's timetable for triggering Article 50 of the Lisbon Treaty was now in jeopardy.

At a news conference, spokeswoman Mina Andreeva said: "The President [of the Commission] explicitly respects the legal order and the consitutional order of the UK and this is now a British affair.

"The timing is now in the hands of the British authorities. We have no further comment to make."

Pressed on details of the conversation, Ms Andreeva said: "It was a short phone call."

Meanwhile, German Foreign Minister Frank-Walter Steinmeier has warned Britain not to delay Brexit talks following the High Court ruling.

After a meeting with Britian’s Foreign Secretary Boris Johnson, Mr Steinmeier said: "We need to ensure that the talks begin quickly even if thecourt decided this week that the British parliament must beconsulted. Further delay isn't in anyone's interests".

Mr Johnson said he did not think the court ruling would interfere with the government's Brexit timetable. He said Brexit could be a "win-win" for Britain and the EU.

Pro-Brexit Conservative MP quits over 'irreconcilable differences'

Stephen Phillips, a pro-Brexit Conservative has resigned as an MP with immediate effect due to "irreconcilable policy differences with the current Government."

Mr Phillips, who has repeatedly called for Ms May to reveal her Brexit plan to Parliament before beginning the formal process of leaving the EU, said he was "unable to properly represent" his constituents.

His resignation will trigger a by-election in his Sleaford and North Hykeham seat, where he had a majority of more than 24,000 at last year's general election.