Laura Kuenssberg from Newsnight caught up with Boris Johnson about the atmosphere in the Commons today which, according to him, "is just like a new day at school".

Watch the brief exchange here, external .

More now on the first meeting this evening of Labour's parliamentary party since their election defeat.

BBC political correspondent Iain Watson says the MPs discussed the possible timetable for electing a new leader and were told by acting party leader Harriet Harman that there were "balanced arguments" over whether a short or long campaign would be best.

After the meeting, Labour sources said there had been no "settled view" on the timing and that the three options were: Before the summer recess; in the autumn but before the annual conference or at the annual conference.

There was however very little appetite for the last option - the party was keen to avoid a repeat of the last leadership eelction and it was felt the new leader should "bed in" before, and not at, a conference.

Chris Leslie, the new shadow chancellor, says it has been a "very bruising week" but that Labour now needs to give people a "sense of trust".

He told the BBC News channel:

Asked if he was going to stand for the Labour leadership, he said: "Oh Gosh. I'm not thinking about any of those things today. One day at a time."

Lord Feldman is appointed Conservative Party Chairman and will attend political cabinet meetings. He replaces Grant Shapps, who is the new international development minister.

Grant Shapps has been moved from party chairman to the post of international development minister, David Cameron has announced.

Starting a new job can be both exciting and nerve-wracking. And if that job is representing a parliamentary constituency for the the first time, it's good to remember to get the essentials right.

Natalie McGarry, external - one of the SNP's "Magnificent Seven" Glasgow MPs - remembered to pack a wardrobe change, thus defeating an exploding pen and arriving covered in ink.

Image source, Natalie McGarry

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Nigel Farage has spoken up on why he is not quitting as UKIP leader after all. Writing in the Daily Telegraph, external , he said:

The thing that has always driven him and is central to his liberalism, Mr Lamb says, is giving people power, and taking it away from unaccountable institutions.

"I've never shrunk away from a challenge." he adds.

"It's terribly important that we articulate a modern vision for this country that connects with people."

And what would make him good at the job of Lib Dem leader?

"To be able to communicate with people, to engage and connect with people, and it's critical that we do that."

Will it be a two-horse race with Tim Farron? Full story here.

Chris Mason
Political Correspondent

The acting leader of the Labour Party, Harriet Harman, has told Labour MPs their job is to "challenge and harry" the Conservatives "every step of the way".

Addressing the Parliamentary Labour Party at Westminster, Ms Harman said: "You are going to be getting up there and at them".

'We have got to throw off any sense of loss or mourning," she added.

"The SNP are going to be strutting down this corridor, they want to see us downcast, we're not going to give them that pleasure."

She expressed frustration at some of the commentary from Labour figures in recent days. "We do have to be truthful about what happened, but not step over the line and cause further problems."

And she spoke at length about the timetable for electing a new Labour leader, setting out a few options including a short campaign with the result by the end of July, or a longer one with a view to the result being later in the year.

Norman Lamb, confirming to the BBC that he will run for the Lib Dem leadership, said he made his decision after "an awful lot" of soul-searching in a period of "complete exhaustion" after the election.

But he concluded he should do it, he said, as “obviously the party suffered devastating results last Thursday. It’s critically important that we reconnect and... have an effective advocate for what modern liberalism is all about.”

Conservative former Scotland Secretary Lord Forsyth said SNP leader Nicola Sturgeon had made "a big mistake" in committing herself to fiscal autonomy, which he said would leave a black hole of up to £9bn in Scotland's finances, depending on the oil price.

"It would mean either massive increases in taxes or massive cuts in public services," said Lord Forsyth. "It is simply undeliverable."

He told a post-election conference in Westminster that the Union was "in mortal danger" and urged David Cameron to produce a White Paper setting out the economic risks of fiscal autonomy.

Environmental charities have welcomed the appointment of Amber Rudd as Energy Secretary, calling it a "hopeful sign" the government is committed to acting on climate change. The Hastings and Rye MP has entered Cabinet for the first time, moving upwards within the department where she was a minister.

Simon Bullock, from Friends of the Earth, said:

Nick Robinson, the Political Editor of BBC News, writes in his blog that while many faces stay the same in the Cabinet reshuffle, it "would be a mistake, however, to see only the continuity and not the change".

He says