THERESA May repeatedly stressed her desire for the UK to leave the customs union as Jeremy Corbyn warned that her "divided" Cabinet is failing to make progress on Brexit.

The Labour leader asked the Prime Minister if she agreed with Foreign Secretary Boris Johnson's view that plans for a customs partnership are "crazy", before pushing her to detail her preferred option.

But Mrs May sidestepped the questions and instead focused on attacking Mr Corbyn's record, claiming he now wanted the UK to stay in the customs union despite spending "an entire career" opposing such an arrangement.

READ MORE: Boris Johnson openly defies Theresa May and calls Brexit customs plan ‘crazy

She also accused Labour of "letting Britain down once again" after telling MPs the Opposition's Brexit strategy meant it would fail to meet its pledge to strike trade deals.

Brexit dominated the leaders' exchanges at Prime Minister's Questions, which saw Deputy Speaker Sir Lindsay Hoyle stand in due to Speaker John Bercow travelling to Glasgow to attend the funeral of his predecessor, Michael Martin.

In his opening question, Mr Corbyn asked: "Does the Prime Minister agree with her Foreign Secretary that the plan for a customs partnership, set out in her Lancaster House speech, is, in fact, crazy?"

Mrs May replied: "We are leaving the European Union, we are leaving the customs union, but of course for our future trade arrangements, trade relationship with the European Union, we will need to agree customs arrangements which will ensure that we leave the customs union, that we can have an independent free trade policy, that we can maintain no hard border between Northern Ireland and Ireland, and that we have as frictionless trade with the European Union as possible.

Analysis: Boris goes on solo Brexit drive again

"I'll tell (Mr Corbyn) what's crazy - what's crazy is a Leader of the Opposition who for years opposed TTIP (Transatlantic Trade and Investment Partnership) and now has a policy that would mean Labour signing up to TTIP with no say in it whatsoever."

Mr Corbyn said Greg Clark appeared to back the "crazy customs partnership" proposal but had made clear he did not back a technological alternative, prompting Mrs May to insist the Business Secretary had said the UK would be leaving the customs union.

Mr Corbyn later quoted Conservative former Cabinet minister Ken Clarke when he asked the PM if she would stand up to the "wild right-wing people".

Mrs May reiterated that the UK is leaving the customs union, adding of Labour's approach: "They want to go into a customs union with the European Union with no say over trade policy, with Brussels negotiating trade deals in their interest not our own.

READ MORE: Boris Johnson openly defies Theresa May and calls Brexit customs plan ‘crazy

"The Labour manifesto said they wanted to strike trade deals, now they've gone back on that policy.

"Typical Labour - letting Britain down once again."

Mr Corbyn said Mrs May led a "divided" Cabinet and had failed to make Brexit progress over the last 23 months, with business leaders and unions casting doubt on her approach to the customs union.

He went on: "Can the Prime Minister tell us what is her preferred option and on what date it will be ready to be implemented?"

Mrs May replied: "He has spent an entire career opposing a customs union. Now when the British people want to come out, he wants to stay in.

"I know he's Leader of the Opposition but that's going a bit far."

Mr Corbyn added: "Due to divisions within the Government these negotiations are in a shambles."

Analysis: Boris goes on solo Brexit drive again

He repeatedly criticised the Government's approach to Brexit and said in his final remarks: "How can they negotiate in the future interests of people's jobs and living standards when Cabinet members are more interested in putting their own futures first?

"Fundamentally, how can this Government negotiate a good deal for Britain to defend people's jobs and living standards when they're unable to reach an agreement within themselves?"

Mrs May defended the Government's economic and employment record, adding: "Last week what we saw up and down this country, whether in Barnet or Dudley or Peteborough, was the British people voting to reject the back to the future economic policy of the Labour Party and the broken promises of Labour.

"They don't trust Labour and they don't trust their leader."