Trading in the pound was quiet on Tuesday before the Supreme Court rules on whether Prime Minister Boris Johnson misled Queen Elizabeth when he asked her to suspend parliament for five weeks until October 14.
Lord Keen said the Prime Minister will comply with the Supreme Court's ruling if it concludes his advice to the Queen was unlawful - but refused to rule out the possibility Mr Johnson may advise the monarch to prorogue Parliament for a second time.
Asked on Monday whether he would resign if the verdict went against him, Johnson told the BBC: "I'm going to wait and see what the judgement is", adding that the government "fully respects the law and fully respects the judiciary".
Jeremy Corbyn, the leader of the opposition Labour Party, and Ian Blackford, leader at Westminster of the Scottish National Party, said they would agree to an election only once Johnson had ruled out leaving the European Union without a deal.
"We lost, we got it wrong", Mr Cox said.
Earlier it was reported that the Attorney-General told the Prime Minister it was lawful to suspend Parliament - advice that 11 of the UK's top judges savaged in their landmark ruling.
This would take effect if the prime minister has failed to get a divorce deal or somehow persuaded MPs to back a "no deal" exit by October 19.
Yvonne Fovargue, Labour MP for Makerfield, said: "This is a damning judgement of this Tory Prime Minister and he should now consider his position for this abuse of power in silencing Parliament at a crucial time in our nation's history".
But a motion of no confidence in the government only needs a majority of one - and could lead to a general election being held. Unless there is some Parliamentary rule of which we are unaware, they can take immediate steps to enable each House to meet as soon as possible.
But he requires the consent of opposition parties to hold a snap election and they are so far reluctant, preferring to use their working majority to keep a tight leash on Johnson as the European Union departure deadline of October 31 looms.
He has called for an election to resolve the current impasse with MPs, who have rejected the current version of the deal struck by his predecessor Theresa May past year.
"This parliament must either stand aside and let this government get Brexit done, or bring a vote of no confidence and finally face the day of reckoning with the voters", Johnson said in a speech that at times was all but drowned out by shouts from other lawmakers.
"I feel disgust watching Johnson", said Nicola Sturgeon, leader of the secessionist Scottish National Party, describing the prime minister as "untrustworthy, craven ... unfit for office in every sense".
While Mr Cruddas wished the then-new prime minister well, he denounced the system that saw him elected. "His days of lying, of cheating and of undermining the rule of law", he said.
The court ruled that Johnson's decision was "unlawful" and that the suspension of Parliament - a process known as prorogation - had no effect.
Mr Johnson now wants to drastically renegotiate the agreement or leave without a deal on 31 October.
He has expressed optimism that he can agree new terms by then, to replace the deal struck by his predecessor Theresa May, which was rejected by MPs.
But EU leaders are not optimistic.