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Jeremy Corbyn marks 100 days as Labour leader tomorrow - so how's he getting on?

The left-winger's election was the biggest upheaval in the party since Tony Blair drove it to the centre ground more than 20 years ago.

It's prompted dramas, fallouts and a furious stand-off between Blarities and Corbynistas - despite his plea for a 'new kind of politics'.

His approach to nuclear weapons, shoot-to-kill and bombing Syria were too much for some of his own MPs, who broke ranks to make a public stand against their leader.

But despite all that fighting the party has still claimed some big achievements.

As Jeremy Corbyn reaches his first milestone, we look at some of the most significant.

1. He helped force a tax credits U-turn

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George Osborne eventually backed down on tax credit cuts after Labour shouted about how badly they would hit poor working families.

It was Labour and Lib Dem peers in the House of Lords who drove the final nail into the £4.5bn plan for welfare cuts.

While Labour's anti-cuts vote was outnumbered by Tories in the Commons, a left-leaning mass in the House of Lords meant a bid to scrap the cuts passed 289-272 .

And Tory MPs who voted for the cuts started trying to soften the blow after the lengthy campaign .

The fight is not over, however - as cuts to Universal Credit will still go ahead .

2. And a police cuts U-turn

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Police were spared rumoured cuts of more than 20% after a relentless campaign by Labour after the Paris attacks.

George Osborne bragged how "the police protect us so we will protect the police" - but he didn't rule out cuts entirely despite promising just that.

The pledge didn't protect officers protecting transport, military and nuclear sites .

And funding will still be cut in real terms by 2.3% a year, according to figures slipped out during an end-of-year avalanche .

3. And a Saudi prisons U-turn

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David Cameron had prompted outrage with a cosy £5.9m contract for the UK to provide “training needs analysis” for staff working in Saudi Arabia’s brutal justice system.

But it was scrapped after Jeremy Corbyn highlighted the cases of Saudi miscarriages of justice.

Tory Michael Gove placed the final straw on the back of the camel which the PM sent marching into the Middle East.

But Labour's leader was also given widespread credit, slamming the "tawdry" deal with a country which sentenced British granddad Karl Andree to 350 lashes for carrying wine .

4. There's been a massive boost in party membership

How Labour membership has exploded Source: Labour/House of Commons Library

Labour membership has almost doubled since May and is almost as high as in Tony Blair's 1997 heyday .

According to the most recent figures 371,000 people are fully paid-up members of Labour, compared to 194,000 when Ed Miliband suffered his election defeat.

While Blairites fear this mean the party is being taken over by 'entryists', glass-half-full members say it will mean an army of campaigners on the doorstep.

That army's already been in action when....

5. Labour defied critics in its first by-election

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Hundreds of Labour activists pounded the streets for the Oldham West and Royton by-election, increasing the party's share of the vote .

The Labour leader only made one appearance during the campaign, and the local party put success down to a strong ground campaign.

But he was also credited with helping the victory, just as he would have been blamed if Labour lost.

Westminster's newest MP Jim McMahon told the Mirror : "If we knocked on 10 doors we might find one person with strong views against him. Other people supported him.

"People wouldn't have come out and voted for me if they thought the party was in disarray."

6. Huge crowds gatecrashed the Tory conference

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When the Tories brought their conference to Manchester this year, the main hall sat just 2,000 people.

Compare that to the 8,000-plus who turned up when Jeremy Corbyn led a rally the city's cathedral - forcing most of them to set up camp outside.

Critics say it won't have represented the country. But it was a powerful reminder of the Labour leader's popular appeal in the Northern Powerhouse.

In a testament to the so-called 'new politics', the gatecrashing broke protocol that says party leaders stay away from their opposite number's autumn bash.

7. Firefighters have re-affiliated after 11 years

(Image: Steve Bainbridge)

Firefighters backed restoring ties with Labour 11 years after scrapping their affiliation amid a bitter pay row with Tony Blair .

The Fire Brigades Union, which has about 38,000 members, supported Mr Corbyn’s successful bid for the top job - and made the vote at a special conference in Blackpool.

Labour MP Jim Fitzpatrick, a former fireman, said: "The more unions affiliated to Labour, the better for the party."

8. There are more public questions at PMQs

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Tory MPs have mocked the Labour leader's habit of using questions from ordinary members of the public.

But it struck a chord with members as 40,000 people submitted their own challenges to David Cameron for Mr Corbyn's first week .

The tactic also captured the imaginations of the public, with 1.1million people tuning in to watch the pair's first despatch box duel.

9. Nationalising the railways is now official policy

(Image: Mark Thomas/REX)

Left-winger Mr Corbyn has long wanted to nationalise the railways - a policy backed even by Tory voters .

It was confirmed as official policy in September when delegates overwhelmingly backed a motion at the party conference in Brighton .

Rail franchises would be brought back into public ownership as they expire - though there are only a handful before 2025.

Mr Corbyn has also told posties he wants to bring Royal mail back into public hands .

10. There's a female majority in shadow cabinet

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When Jeremy Corbyn drip-fed the details of his shadow cabinet, critics (including in Labour) seized on the lack of women in the four great 'offices of state' .

But those close to the Labour leader insisted the nay-sayers had overlooked one key point.

For the first time shadow cabinet has more women than men - with the 16 female members just tipping the balance from the 15 men.

11. Last but not least... He's got a prizewinning beard

The Labour leader scored a record 6th victory in Parliamentary Beard of the Year - despite a severe trim.

Last-minute tweeting from Diane Abbott helped him soar ahead of the SNP's Stewart McDonald minutes before polls closed - an echo of his bid to enter the Labour leadership race.

Mr Corbyn has won the award more than any other MP, claiming the coveted certificate in 2001, 2007, 2011, 2012 and 2014.