Labour is not going to block Brexit "in a trivial way," shadow Home Secretary Diane Abbott has said.

When she was asked whether Labour would uphold a parliamentary vote on Brexit, Ms Abbott told the BBC's Andrew Marr Show: "We're not going to block it in a trivial way. But there are really important issues for the British economy.

She added: "If we lose access to the single market, let alone the customs union, would be a huge blow to the British economy."

Pressed by BBC political editor Nick Robinson, who was standing in as host of the show, on whether Labour might block or delay Brexit under those circumstances, Ms Abbott replied: "No. Block sounds like we're being wilful.

"We will make the case or what's right for the British economy. What else would you expect us to do?"

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

Earlier on Sunday, John McDonnell said both Andy Burnham and Ms Abbott speak for Labour on Brexit.

Ms Abbott and Mr McDonnell said the party was in favour of a fair system to control immigration.

But both also stressed the importance of the economy during Brexit negotiations, with Ms Abbott saying freedom of movement was "inextricably linked" with access to the single market.

Ms Abbott said: "We believe in regional autonomy and Andy [Burnham] has always had those views.

"But the truth is you cannot have access to the single market without a measure of freedom of movement.

"My experiences of Labour party members all over the country want immigration rules that are fair and they want reasonable management of migration."

She added that it "would be wrong to put the economy anything other than first" as part of Brexit negotiations.

Will you be able to remain an EU citizen after Brexit?

Ms Abbott also said Jeremy Corbyn would close the gap in the polls with Theresa May within the next 12 months.

She said: “I'm confident we can close the gap in the coming 12 months.

“We've had a pretty difficult 12 months, partly Jeremy's enemies in the party, partly commentators, but we have the right policies and we have the right leader.”