Here's a summary of a busy day at Westminster and beyond:

• Downing Street has said the Russian plane that crashed in Egypt at the weekend "may well have been brought down by an explosive device" and that all flights between the UK and Sharm el-Sheikh have been suspended
• A long-awaited draft law governing online surveillance has been unveiled in the Commons
• At Prime Minister's Questions, Labour leader Jeremy Corbyn warned of a "winter crisis" in the NHS
• Health Secretary Jeremy Hunt is writing to all 50,000 junior doctors in England in a last ditch attempt to persuade them not to take industrial action
• MPs say HM Revenue and Customs is still failing UK taxpayers in a damning select committee report

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Transport Secretary Patrick McLoughlin says the safety of British citizens "will always be the priority" for the government and the delay to flights from Sharm to the UK will "allow us time to ensure that the right security measures are in place" at the airport. When the review is completed to the UK's satisfaction, flights will be allowed to depart, he tells the BBC.

Downing Street says the Foreign Office's advice for travel to Egypt has not changed, external as a result of tonight's developments. While it advises against all travel to North Sinai and all but essential travel to large parts of South Sinai, it points out that more than 900,000 British nationals visit Egypt every year and most of these trips are trouble-free.

Image source, Thinkstock

After weeks of conflicting reports, the draft Investigatory Powers Bill has been revealed.

It represents the UK government's attempt to update and tidy up the powers the authorities have to delve into the public's data to combat crime.

It is a huge document, external - but at its heart is the argument it is illogical officials can scan through itemised lists of the phone calls people make but not the websites and chat apps they use.

So, the bill proposes the authorities be given the right to retrospectively check people's "internet connection records" without having to obtain a warrant.

More here.

BBC News Channel

Home Affairs Committee chairman Keith Vaz says the prime minister has taken "the right course of action" in delaying flights from Sharm el-Sheikh to the UK but adds that the resort is one of the most popular destinations for British holidaymakers in the world and the situation must be kept under constant review.

The Labour MP says the developments are "deeply concerning" and "very serious". He suggests that British security experts could use their expertise to advise their counterparts in Egypt as they did in Tunisia after the terrorist attacks in Sousse earlier this year. 

British Airways, whose next flight to Sharm is due to depart tomorrow morning, has issued a statement: "Things are moving fast and we are waiting for the government to update later in the evening," it said. 

The statement comes on the day that Egyptian president President Abdul Fattah al-Sisi arrived in London for a visit.

The BBC's Christian Fraser says he understands that the statement may have been delayed to ensure the language was appropriate, mindful of the potential damage to the Egyptian tourist industry.

About 2,000 British holidaymakers are currently in the Egyptian resort and two flights are scheduled to leave for Sharm from Gatwick tomorrow morning.

BBC assistant political editor Norman Smith says he understands that the decision to halt flights was not based on any intelligence of a specific threat but amid growing conviction that the Russian airliner was "brought down by a bomb" and awareness that security at Sharm airport needs to be beefed up. 

The government says the delay on flights from Sharm el-Sheikh to the UK is "temporary" and will remain in place pending an assessment by British aviation security experts who are currently travelling to Egypt. That review is expected to be concluded tonight. It says there are no UK flights leaving for the Egyptian resort this evening.

David Anderson QC, the independent reviewer of terror laws, says the new draft Investigatory Power Bill "puts Parliament in charge". Writing on his website, external, he said:

Mr Anderson, who called for a new law in a report in June, says not everyone will be happy at the powers given to the authorities, and that "opinions will differ" over whether the safeguards are enough. There should be "no question" of the judges "operating as rubber stamps", he says. He's now speaking on BBC Radio 4's PM programme.

The government has said that flights from Egyptian resort Sharm-el-Sheikh to Britain due to leave this evening will be delayed as a security precaution in the aftermath of the fatal crash of a Russian airliner last weekend. In a statement, Downing Street said: 

Here's a legal viewpoint on the government's plans from Marc Dautlich, a partner at solicitors Pinsent Masons. He says:

Responding to the draft Investigatory Powers Bill, the Web Foundation, set up by World Wide Web inventor Sir Tim Berners-Lee, says the government has failed on its promise that the bill would be "clear, comprehensible, and included "world leading" oversight. Anne Jellema, CEO, said:

Earlier we reported that the Cabinet Secretary Sir Jeremy Heywood is understood to have advised ministers that any attempt to ban EU migrants from claiming tax credits for four years - as part of negotiations on the UK's membership of the EU - could be deemed illegal. It appears that Downing Street has now responded. 

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Andy Burnham, Labour's shadow home secretary, has welcomed the government's new proposals on surveillance. He told BBC News the "safety of our constituents" was more important than "party politics".

He backed the continued involvement of the home secretary in the authorisation of warrants, saying Theresa May had  "got the balance right" between politicians and the judiciary.

But he said "further safeguards" were needed on the bulk collection of data and that he would be pushing for changes to be made to the legislation as it progressed through parliament.