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Boris Johnson will today send his "final offer" on Brexit to the EU with a dramatic ultimatum that Brussels must now agree a deal within 9 days.

The PM prompted a backlash with his new stance as he said an October 11 deadline "should be enough" - and otherwise he'll go full-tilt for a no-deal Brexit.

The short deadline comes despite the Tory leader blowing 70 days on negotiation before he finally came up with today's written plans.

The Mirror understands UK officials were pleading with the EU to keep the full legal text secret.

But huge tracts of the new Brexit plan - dubbed "two borders for four years" - emerged last night in a major leak to the Daily Telegraph.

The leak claims there will be a regulatory border between Northern Ireland and Great Britain - and customs checks between Northern Ireland and the Republic.

(Image: AFP/Getty Images)

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The need for a double 'border' is because Northern Ireland, with the UK, would leave the EU customs union.

Yet it would remain temporarily aligned with the EU's single market rules for agriculture and industrial goods.

Downing Street believes the plans will not cross the EU's 'red lines' and will allow for a fully open border on the island of Ireland.

But it could effectively leave Northern Ireland in large parts of the EU's single market until 2025.

It's claimed Northern Irish parties will then get a say after four years on whether they want to continue alignment on EU single market, or converge with the British mainland.

(Image: Charles McQuillan)

The proposal is different from Theresa May's 'backstop' - which left the UK inside the EU customs union indefinitely to prevent border checks.

Crucially, it's reported Boris Johnson's DUP allies are fairly content with the plans - after the PM appeared with leader Arlene Foster at a rowdy rally last night.

Yet Ireland's government reacted angrily as deputy PM Simon Coveney said it was “no basis for an agreement” and “concerning to say the least”.

And former Northern Ireland secretary Lord Hain suggested that the Brexit plan could break the law and "sabotage" the Good Friday Agreement.

(Image: AFP/Getty Images)

Ireland's reaction ramps up the chances of the deal being rejected and Britain hurtling towards a no-deal Brexit instead.

Downing Street last night said the plans sent to the EU this afternoon will be Britain's "final offer".

And if the EU do not engage with it, Boris Johnson will throw the entire force of the government behind preparing for a damaging no-deal on October 31.

(Image: REUTERS)

A defiant senior Number 10 official said: "The Government is either going to be negotiating a new deal or working on no deal.

"Nobody will work on delay.

"We will keep fighting to respect the biggest democratic vote in British history.

"The EU is obliged by EU law only to negotiate with member state governments, they cannot negotiate with Parliament, and this government will not negotiate delay."

Mr Johnson will use his keynote Tory conference speech in Manchester to accuse dark unknown "forces" of wanting to stop Brexit.

(Image: AFP/Getty Images)

In a hardline address he will say: "After three and a half years people are beginning to feel that they are being taken for fools.

"They are beginning to suspect that there are forces in this country that simply don’t want Brexit delivered at all.

"And if they turn out to be right in that suspicion then I believe there will be grave consequences for trust in democracy."

Mr Johnson is now aiming to reach a deal with the EU by October 11, when the agenda for an EU summit on October 17 will be set.

The Prime Minister told The Sun : "Ten days should be enough.

"If there’s a deal to be done, it could be done in that time. Genuinely. If there isn’t, then we’ll know. That’s the truth.

"It’s new deal or no deal, because we must come out."

His comments come despite MPs passing a law which will force the PM to ask for a three-month delay to Brexit if there's no deal by October 19.

Ministers have confirmed they plan to use a loophole to get round the delay law - leaving MPs enraged.

It's thought that may involve Boris Johnson asking EU leaders to reject any extension once he's asked for it.

Tory chairman James Cleverly confirmed he had not seen the details of what was to be proposed to Brussels later on Wednesday.

He told the BBC: "It's really important with negotiations of this importance and sensitivity that it is kept tight.

"These negotiations have been done by a trusted team. It is absolutely right and appropriate that, that we keep this tight."

Speaking at a DUP reception last night, Mr Johnson tried to distract from the row by focusing on Labour.

He said: “Let's get ready together to get, take, invite, that threat to the Union, Jeremy Corbyn, to step quietly into a figurative rocket and then let us send him into orbit where he belongs.”

He will add today: "Let's get Brexit done on October 31 so in 2020 our country can move on."