Laura Kuenssberg
BBC political editor

There has been controversy around this for a long time.

There is a terrible brutal war going on in Yemen and the controversy is around how much business the UK does with Saudi Arabia... and whether it allows that war to get worse.

The argument from Mr Corbyn, his backers and others is, surely, the UK should follow the example of other countries and stop selling weapons to the country.

But the government has always said it is much more complicated than that and there is a very tricky pattern of violence in Yemen.

It is a huge issue here, but not just for Labour MPs. Questions on it came from former Foreign Office minister Alistair Burt and former cabinet minister Andrew Mitchell at PMQs too.

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House of Commons
Parliament

Labour's Khalid Mahmood says a recent survey of Tory Party members showed an "astounding level of racism" towards Muslims, adding the party is now "increasingly nasty".

He asks her to commit to commissioning an external inquiry into Islamophobia within the party. The contenders to replace her did so during a TV debate earlier this month.

In reply, Theresa May says the Conservatives take Islamophobia allegations "extremely seriously", and says each one is "properly investigated".

She says this is "in direct contrast" to how Labour has handled allegations of anti-Semitism.

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Parliament

Tory MP and former Brexit minister Suella Braverman tells the Commons she is due to give birth "any day now" and hopes "there wont be an emergency in the Commons".

But she thanks the prime minister for her work to bring in the proxy voting scheme that allows MPs on maternity leave to still take part in votes while at home.

Mrs May says she has "satisfaction in playing a little role in ensuring her husband got married".

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SNP Westminster leader Ian Blackford picks up on Boris Johnson's comments yesterday that he would take the UK out of the EU "do or die" by the end of October.

He asks Theresa May for a pledge never to vote for a leadership candidate prepared to leave the EU without a deal, which he says would be "devastating".

In a follow up question, he calls Mr Johnson the "most incompetent foreign secretary in a century" and says he has "made a career out of lying".

The noise in the chamber rises to a roar at that, with Tory MPs furious at the remark.

Replying, Theresa May says either of the two Tory leadership candidates would make a "darn sight better" PM than anyone on the opposition benches.

It's the second week in a row that Mr Blackford has used his questions to launch a full-throated assault on Mr Johnson's character.

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Mr Corbyn says there is "overwhelming evidence of war crimes in Yemen by Saudi Arabian forces".

He adds: "The UK has supplied them with over £4.5bn worth of deadly weapons used in indiscriminate attacks on civilians in which 200,000 have been killed."

But Mrs May says: "Bringing about peace is exactly what we are working with our international partners through the United Nations to do."

She then criticises some of the "relationships" Mr Corbyn supports, accusing him of giving sympathy to Russia, the IRA, and Iran.

"He never backs Britain and he should never be prime minister," she adds.

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Jeremy Corbyn turns to the killing of journalist Jamal Khashoggi.

He says a UN report last week stated there was evidence high-level Saudi officials were behind his death at the hands of Saudi agents inside the country's consulate in Istanbul, and Mr Corbyn asks whether the PM agrees with it.

Theresa May says she has raised the issue with Saudi Arabia's Crown Prince Mohammed bin Salman twice, most recently at a summit in Egypt.

She says the best way to resolve this is through a "judicial process" taking place according to international standards.

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Mr Corbyn remains unsatisfied with her answers, and asks: "Why is the government appealing the judgement rather than promoting a peace settlement in Yemen?"

He says the UN has been saying for three years that Saudia Arabia has been violating international law.

"The government says there can be no military solution - if that is the case, why have they pumped billions into Saudi military [operations]?"

Mrs May replies: "What we do believe... is the only way to ensure the security and stability of Yemen in the future is through a political settlement."

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Jeremy Corbyn says UK and EU rules state that arms sales should not be made if there is a "clear risk" that they might be used to break international humanitarian law.

He says to listen to Saudi Arabia's defence of its rights record is to "ignore all evidence on the ground".

Theresa May replies that the court judgement was not about decisions on arms sales per se, but on the decision-making process specifically.

She adds that the government is concerned about the humanitarian situation as a result of the war in Yemen and has given £770m in support.

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Mr Corbyn says Germany has banned armed exports to Saudi Arabia and so has Denmark.

He says the UN has described the situation in Yemen as "humanity's biggest preventable disaster", but he says the UK government "sees fit to carry on selling arms".

Mr Corbyn asks Mrs May if she believes there are "serious ongoing violations by Saudi Arabia in Yemen, yes or no?"

Mrs May declines to give a one-word answer, instead saying the government has held meetings expressing concerns on escalating tensions.

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For his first question, Jeremy Corbyn asks Theresa May whether she disagrees with a recent High Court ruling over the UK government's decision to allow arms sales to Saudi Arabia.

Judges said licences should be reviewed but would not be immediately suspended.

The prime minister replies that ministers were "disappointed" with the finding and will appeal.

She says the UK's arms export control regime is "one of the most robust" in the world.

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Conservative MP Julian Sturdy says the "biggest restraint" to the Yorkshire economy is the lack of devolution and asks the PM what is to be done.

Mrs May says she "absolutely recognises the enthusiasm and dedication in Yorkshire for devolution" of powers and says the government "shares the ambition on doing the best" for the region.

She adds that discussions are ongoing.