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Theresa May's suddenly turned over a miraculous new leaf.

A year after she got into No10, she's asking rival parties for ideas - telling them to "contribute, not just criticise".

Her right-hand man Damian Green calls it "grown-up politics". He urged MPs to do something for the country "rather than just sit in the trenches and shell each other".

Sitting in trenches doesn't sound like Theresa May at all. Or does it?

What about the times she refused to heed other people's warnings?

Or when she said her rivals would be a disaster?

Labour have already dismissed her call, saying: "No-one will be fooled."

So here's our round-up of her most stubborn moments - that show just how difficult that unity will be.

1. When she hid the dementia tax from her own MPs

(Image: Andy Stenning / Daily Mirror)

If there's one thing no leader can screw up, it's the policy they announce on the day they launch their manifesto.

But Theresa May managed just that with her so-called dementia tax , which prompted a backlash in her own party and forced her to make a partial U-turn.

Unlike Labour's manifesto, which was thrashed out in a meeting of more than 80 people and promptly leaked, Theresa May's plan was kept between herself and just a select few allies and aides.

Many MPs had no idea the dementia tax was going to happen until it appeared on the front pages on the day of the Tory manifesto launch.

Now it's been ditched anyway because Mrs May failed to win a majority... in part because of the levy.

2. When she accused the EU of trying to sabotage the general election

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She's supposed to be on a charm offensive with the EU as she negotiates Brexit .

But Theresa May launched an extraordinary attack on her negotiating partners, accusing them of trying to sabotage both the general election and Brexit .

In a major speech back in April, the Tory leader said some in Brussels "do not want Britain to prosper".

She claimed damning leaks and talk of a vast 'divorce bill' were "threats" that were "deliberately timed to affect the result of the general election."

Hardly an olive branch.

3. When she constantly attacked Jeremy Corbyn

(Image: AFP)

It's no surprise that the Prime Minister and Leader of the Opposition are at each other's throats.

But Theresa May's incredible attacks on Jeremy Corbyn will come back to haunt her if she's asking him to 'contribute'.

One extraordinary broadside came in the wake of the the Manchester terror attack, when the Labour leader highlighted failed Western intervention in the Middle East - some of which came under Labour.

Despite Mr Corbyn saying "the blame is with the terrorists", she seized on his words for political ends, saying: " Jeremy Corbyn has said the terrorist attacks in Britain are our own fault."

Or what about five days ago, when she said: "I know that he has taken to calling himself a 'Government in waiting.'

"Well, we all know what that means: waiting to put up taxes; waiting to destroy jobs; and waiting to bankrupt our country. We will never let it happen."

4. When she got in a flap about the public sector cap

(Image: Philip Coburn/Daily Mirror)

Countless politicians - including her own Cabinet ministers - have in the last few weeks been pushing Theresa May to ditch the 1% cap on public sector workers' pay rises.

But the noises coming out of 10 Downing Street are very confusing.

Mrs May says she's going to listen to pay review bodies, which have said the cap is unsustainable. Yet at the same time she also launched into a hardline defence of austerity when challenged by Jeremy Corbyn .

No10 strongly hinted the cap would be scrapped, but U-turned within hours after what's thought to have been an intervention from the Chancellor.

Didn't she tell him first?

5. When her deputy attacked Labour... hours after her unity pledge

(Image: REUTERS)

Damian Green, the PM's right hand man as First Secretary of State, had the unenviable task of defending her new position on the radio today.

But no sooner had he made his call for 'grown up politics' than he launched into a skewed attack on Labour.

He tore into the Shadow Education Secretary, who said the party's ambition to wipe out all student debt would cost £100billion.

"Angela Rayner has admitted one of the things they'd forgotten was that Labour's promise to end student debt would cost £100billion that they hadn't had in their manifesto," he said.

"£100billion is roughly what we spend on the NHS in a year. It's an extraordinary sum of money."

In fact, what Ms Rayner actually said is the policy was an "ambition". It wasn't in Labour's manifesto because the party wasn't confident it could be afforded.

6. When her claims about NHS cash were branded wrong by her own party

(Image: PA)

Two powerful MPs warned Theresa May's repeated claims she is pumping £10bn into the NHS risked misleading the public.

Sarah Wollaston, who chaired the Commons Health Committee, and Tory committee member Dr James Davies said the figure gave the “false impression” the health service is “awash with cash”.

The Prime Minister and Health Secretary Jeremy Hunt repeatedly made the £10bn spending claim last year, with Mrs May telling the 2016 Tory conference her party was "investing an extra £10bn in the NHS – more than its leaders asked for".

In fact, the MPs said the real figure was £4.5bn over five years because of billions in cuts to other health and care budgets.

And NHS England chief executive Simon Stevens said the boast of £10bn was "stretching it".

Yet the Prime Minister repeated her claim, including in February this year. And she later announced £8billion of funds during the election campaign but refused to say where they would come from.

7. When she was accused of silencing her own drugs experts

Back when she was Home Secretary, Theresa May was accused of silencing her own drugs experts to bring in a legal highs ban.

The Psychoactive Substances Act originally failed to mention the Advisory Council on the Misuse of Drugs, campaigners said.

That was despite the panel of scientists being set up more than 40 years ago to make sure new drugs laws are based on hard evidence.

Instead Mrs May could decide what should be illegal by consulting anyone she 'considers appropriate'.

References to the Council were added into the final Act after ex-Met Police chief Brian Paddick, a Lib Dem peer, said the government "seems to be hell-bent on ignoring the scientific evidence".

Labour peer Lord Patel - who spent four years on the council in the 1990s - also protested despite his party backing the Act overall. He said: "It just seems bizarre that you wouldn't go to the body Parliament set up for you to talk to."

Police have now blamed the Act for a rise in the dangerous substance Spice, telling the Manchester Evening News: "The reality is that it has shifted supply onto the streets".

8. When she stuck to her failed immigration cap

(Image: Getty)

Despite pleas from her own party Mrs May has refused to drop the target, made in 2010 and never reached, to cut net immigration below 100,000 a year.

She even re-stated it before the 2017 general election, even though her ministers admitted it might not be achieved in five years.

An editorial in the Evening Standard, edited by ex-Chancellor George Osborne, said: "She didn’t need to make this politically rash and economically illiterate move."

Tory modernisers' think tank Bright Blue added the "arbitrary, indiscriminate and unachievable" policy should be ditched.

9. When she wouldn't give up on grammar schools

(Image: Getty)

Theresa May loves grammar schools so much she made extending them one of her first announced policies as Prime Minister.

But the plan to lavish more than £1billion on them and free schools while other schools face cuts prompted discomfort in the Conservative Party.

Despite ex-Education Secretary Nicky Morgan saying it "risks undermining progress" Mrs May pressed on with her plan, putting it in the Tory manifesto.

The government also released research that oddly tried to claim grammars help social mobility at the same time as airbrushing out the poorest.

Eventually Mrs May was forced to give up her plan, but only after failing to win a majority at the general election.