Gina Miller has slammed the Government for playing X Factor politics with the critical Brexit legal challenge going through the Supreme Court.

Ms Miller, the philanthropist who brought the case, said a news report about how the Government was predicting a less-impressive-than-expected win for her side showed ministers were treating the crucial decision with as much seriousness as if it were being taken by judges on the Saturday night TV show.

Speaking exclusively to The Independent, she said the news report showed Brexiteers had accepted they would lose and were now trying to put a favourable “spin” on defeat.

She said the report – which appeared in The Daily Telegraph with details of the Supreme Court judges’ backgrounds – represented a “veiled threat” against the judiciary as they determine legal points crucial to the UK’s future.

Ms Miller said: “What was really fantastic about the past week in court was how considered the coverage was. It really highlighted as we move forward on everything to do with Brexit, how things should be conducted, with the tone we have seen.

“But then what happens? This huge spin story comes up and we’ve already lost all that sobriety.

“This is not The X Factor. This is so serious. The judges are going to take their time, they are going to make a considered judgement.”

Gina Miller gives statement after High Court rules triggering article 50 must go through parliament

Ms Miller headed a group of campaigners who took the Government to the High Court to challenge Theresa May’s claim that she could unilaterally trigger Article 50, launching the Brexit process without a vote in Parliament.

After she won the case, forcing Ms May to give MPs a vote, the Government appealed to the Supreme Court where 11 judges took evidence this week. They are expected to give a verdict next month.

But with deliberations ongoing, a Daily Telegraph report quoted an anonymous government source suggesting the Supreme Court’s decision will be much closer than previously thought.

While the anonymous source conceded Ms Miller may win – meaning the Prime Minister must bring forward legislation for MPs to vote on – the piece then argued a narrow Supreme Court victory would mean MPs have less justification to amend Ms May’s legislation.

The piece also carried a list of the Supreme Court’s judges, setting out their backgrounds and links some have with the EU.

Supreme Court Brexit Challenge Show all 13 1 /13 Supreme Court Brexit Challenge Supreme Court Brexit Challenge People wait to enter the public gallery outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge Gina Miller, co-founder of investment fund SCM Private arrives at the Supreme court in London on the first day of a four-day hearing Getty Supreme Court Brexit Challenge A man waves the EU flag in front of the Supreme Court Getty Supreme Court Brexit Challenge Satirical artist Kaya Mar poses with two of his paintings in front of the Supreme Court Getty Supreme Court Brexit Challenge Pro-Europe protestors dressed as Supreme Court Justices stand outside the Supreme Court ahead of the first day of a hearing into whether Parliament's consent is required before the Brexit process can begin. The eleven Supreme Court Justices will hear the government's appeal, following the High Court's recent decision that only Parliament can trigger Article 50 Getty Supreme Court Brexit Challenge The eleven Supreme Court Justices will hear the government's appeal, following the High Court's recent decision that only Parliament can trigger Article 50 Getty Supreme Court Brexit Challenge Businesswoman Gina Miller arrives at the Supreme Court ahead of the first day of a hearing into whether Parliament's consent is required before the Brexit process can begin Getty Supreme Court Brexit Challenge Attorney General Jeremy Wright arrives at the Supreme Court in London EPA Supreme Court Brexit Challenge Protesters outside the Supreme Court in London, where the Government is appealing against a ruling that the Prime Minister must seek MPs' approval to trigger the process of taking Britain out of the European Union PA wire Supreme Court Brexit Challenge A protesters wearing a judge's wigs and robes stands outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge A protester holds up a placard outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge Pro-Europe protestors dressed as Supreme Court Justices stand outside the Supreme Court Getty Supreme Court Brexit Challenge A man waiting to enter the public gallery waves a European Union flag outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters

Ms Miller said: "It’s pure spin. The message of the article is this: yes, we the Government are going to lose, but beware judges, those of you who might be on the other side, those who might have an EU connection. There’s a slight warning to them, there’s a veiled threat there, which impinges on their independence.

“The whole idea is that this is not about politics. But they have already started spinning it that way.”

She said it would be “fruitless” to speculate on the outcome of the case as there were so many nuanced issues involved.