Here's some more on Lord Warner's resignation of the Labour whip this evening. It has rounded off a lively day in politics, as the Treasury defended its controversial cuts to tax credits, Chinese President Xi Jinping arrived in the UK for his state visit, and MPs debated the protection they get from spying.

Also in the Commons, celebrity chef Jamie Oliver gave a warning about sugar levels in children's food, while earlier Home Secretary Theresa May unveiled new plans to tackle extremism.

Image source, PA

The government has defended its cuts to tax credits, saying reforms made since 2010 will save taxpayers £15bn a year.

The Treasury released its analysis to the BBC as ministers faced calls to rethink the latest changes, which come into force in April.

London mayor Boris Johnson is among those to have warned about the need to protect low-paid workers.

Labour has pledged to reverse the changes and is urging Tories to oppose them in a Commons vote on Tuesday.

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The Psychoactive Substances Bill is at second reading stage in the Commons.

MPs are considering the main principles of a bill which has already passed all its stages in the House of Lords.

The bill would ban “new psychoactive substances” - sometimes called "legal highs".

In effect the legislation bans psychoactive substances, with exclusions for legitimate substances such as food, alcohol, tobacco, nicotine, caffeine and medical products.

Image source, AP

The UK aims to take in 1,000 Syrian refugees by Christmas, Prime Minister David Cameron has said.

About 260 Syrians have already arrived in the UK as part of the government's scheme to relocate 20,000 people from camps neighbouring Syria by 2020.

Labour leader Jeremy Corbyn said the government's negotiating power on European Union reform could be boosted if the UK accepted more refugees.

But the PM insisted the UK's stance had gained "a lot of respect" in the EU.

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Here's a recap on the main developments in Westminster so far on Monday.

- The home secretary Theresa May vows to "systematically confront and challenge extremist ideology" as she detailed new curbs on those who "spread hate".

- Boris Johnson says he is "sure" Chancellor George Osborne can come up with a way to protect people on low incomes from tax credit cuts as the row over the policy rumbles on.

- David Cameron pledges to raise the issue of subsidised Chinese steel during talks with President Xi Jinping this week as another British steelmaker goes into administration

- The UK expects to take in 1,000 Syrian refugees by Christmas, David Cameron reveals as he defends the UK's response

- It emerges that Cabinet Secretary Sir Jeremy Heywood wrote to government ministers in the run up to the party conference season, warning them against speaking out over the issue of airport capacity and a new Heathrow runway.  

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The Commons has moved onto an emergency debate called by Labour on the so-called Wilson Doctrine, the protocol established by former Labour prime minister Harold Wilson that MPs should have special legal protection against surveillance by the security services and the interception of their communications. Shadow culture secretary Chris Bryant says the doctrine had been upheld by prime ministers since then, including Margaret Thatcher and Tony Blair. But he says a recent tribunal ruling proved the doctrine is "no longer in force and is no more than a self-denying ordinance that can be easily ignored". But Home Secretary Theresa May shouts across the despatch box that the doctrine is still in force. 

There were plenty of heavy hitters on the frontbench for the grammar school statement with Michael Gove, the former education secretary and Michael Fallon, the defence secretary and MP for Sevenoaks, among those present. Tory MPs were united in their praise for the decision to allow Weald of Kent to expand, Richard Fuller congratulating Ms Morgan on "ignoring ideology and making a straightforward judgement". 

The education debate proved pretty lively with Speaker John Bercow intervening on several occasions to criticise "chuntering" by MPs. A series of MPs from all parties prefaced their contributions by remarking that they are the product of a grammar school education, prompting Ms Morgan to say it has been "rather a confessional hour". Labour MP Jess Phillips was one of those but takes a slightly different view than Conservative MPs on their merits. She tells MPs that she lives close to a grammar school but does not think it is the right choice for her son, who has asperger's syndrome.

Earlier David Cameron told the Commons the EU must make it possible to be a successful member outside the eurozone, not just countries inside.

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It is Labour's education spokeswoman Lucy Powell's chance to respond. She attacks the government's handling of the issue, saying the proposed annexe is 10 miles away from the existing school site in Tonbridge and is to all extent and purpose a new school. She says its approval could "open the floodgates" for other grammar schools looking to expand and this would be detrimental to the schools system as a whole. She says all the evidence shows that grammar schools are not "bastions of social mobility but entrench social advantage".

Jamie Oliver tells MPs doing nothing about sugar isn't an option and says a sugar tax should be considered.

He added whether he won or failed he hoped the campaign would highlight the issue of clarity, choice and the amount of sugar children are consuming.

Nicky Morgan says she personally looked into the legal grounds for the school's expansion and was satisfied it did not breach existing rules. She continues by saying that the government is committed to protecting the UK's 163 grammar schools but has no plans to change existing policy. Any requests to create new grammar schools with selective admissions arrangements will be judged on their own merits and must meet the existing criteria. She says there are "no applications sitting on her desk" for new grammar schools or others looking to expand. 

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Nicky Morgan is now addressing MPs about the government's decision to allow the expansion of the Weald of Kent grammar school by the building of a new annexe. She says the school is "outstanding" and that, given the pressure on school places, it would be "perverse" not to allow it to build a new site merely because it is a grammar school. The two sites will be fully integrated, she adds, with the sites sharing leadership, administration, governance and admissions arrangements.

After more than 70 minutes, David Cameron concludes his statement and is succeeded at the despatch box by Education Secretary Nicky Morgan who is making a statement about grammar schools expansion. This is punctuated by a rather surreal moment as Ms Morgan shouts "PM, PM" in the direction of David Cameron as he departs the chamber. Then she hands something to him - it looks like he left his pen on the despatch box.

Celebrity chef Jamie Oliver tells the health committee advertising sugary foods to children should be stopped.

Mr Oliver said it was important to focus on times when children may be watching popular TV programmes and said the issue of online advertising had yet to be considered.

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The SNP's Stewart MacDonald says so-called benefit tourism - people coming from Europe to the UK purely to claim welfare - is the "biggest canard in British politics" and suggests that the UK should stand up for freedom of movement rules rather than encouraging the "Johnny Foreigner" attitudes on the Tory benches. While acknowledging outright benefit tourism is "small", Mr Cameron says there is a real problem with the extent to which migrants can get immediate access to in-work benefits. He says the British public understands this needs to be addressed "even though it has not got through to the SNP". 

In response to a question from Conservative MP Bernard Jenkin about the business case for either staying or leaving the EU, David Cameron appears to praise businessman Stuart Rose, the head of the Britain Stronger in Europe campaign group, claiming he has said "many sensible things" on the subject and not taken a "widely hysterical view". When it comes to the referendum, he suggests the In campaign may be able to point "very clearly" to the commercial benefits of remaining in Europe and the EU single market "with a vote and a say" and adds.