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Jeremy Corbyn’s seat looks set to disappear in a new map of boundaries, the Evening Standard has learned.

The Labour leader is currently MP for Islington North, but this will cease to exist in a controversial review ordered by the Tory Government.

Leaked details of the proposals, which will be published overnight by the Boundaries Commission, say his seat will be carved up and the pieces allocated to neighbouring seats.

The development came as Mr Corbyn celebrated one year as Labour leader.

A big chunk will go to a new seat of Finsbury Park and Stoke Newington - which will also be allocated a slice of Diane Abbot’s current seat.

Small chunks of his seat will go to the new Islington constituency and to Holborn & St Pancras. Half of Ms Abbott’s current seat will go into a new constituency called Hackney Central, which will also take half of nearby MP Meg Hillier’s seat.

In future, there will only be one Islington seat, rather than two. And the majority of the seat will be made up of Islington South, which is held by Mr Corbyn’s ally Emily Thornberry.

Ms Thornberry, the shadow foreign Secretary, has a strong claim to stand in the seat under party rules because so much of it was already hers.

Under complex Labour Party rules, Ms Thornberry and Ms Abbott both have a strong claim to the two safe seats created with bits of Mr Corbyn’s seat – but he does not.

The rules say an MP has a right to stand if the new seat contains four-tenths of their old seat.

Another nightmare for Mr Corbyn is that if either of the two powerful women volunteered the step-aside for him, under the party rules they would normally have an all-woman shortlist.

Education Secretary Justine Greening, international trade minister Greg Hands and Treasury minister Jane Ellison are also in constituencies that are likely to be affected by the review.

Mr Hands’s Chelsea and Fulham seat is the third smallest in the capital, with only 62,958 voters. He looks set to be badly affected, with his current seat of Chelsea and Fulham losing safe Tory wards and gaining chunks of Labour-voting wards, and renamed Hammersmith & Fulham.

The Boundaries Commission aims to create 68 seats with between 71,000 and 78,500 voters each. Its report will conclude that 43 of the 73 existing London constituencies are too small.

Education Secretary Justine Greening could end up a winner from the carve-up, even though her Putney seat is radically changed. She is well-placed to be MP for a new constituency of Wimbledon Common & Putney, which adds on leafy parts of Wimbledon Common where the Tory vote is high.

London’s smallest constituency at present is Kensington, with just 55,432 voters, which means sitting Tory MP Victoria Borwick could be under threat. The biggest is Labour MP Lyn Brown’s West Ham with 86,902.

Other under-sized seats include Conservative MP Mark Field’s Cities of London & Westminster, with 58,071 on the 2015 voters’ register

Boris Johnson will also see huge changes, with chunks of his current seat being divided up. But he stands a high chance of ending up as MP for newly-drawn Hillingdon & Uxbridge.

It was reported that ex-Chancellor George Osborne’s seat of Tatton will also be among those abolished. Nationally, there will be 50 fewer MPs, with a reduction in the number of constituencies from 650 to 600.

Jane Ellison, the Treasury Minister, looks as though she will come under pressure from Labour. Her marginal Battersea constituency remains on the map – but is proposed to takes in a strongly Labour ward from Lambeth.

Overall, London loses five seats – two from south of the Thames and three from north – cutting the number of MPs in the capital from 73 to 68. MPs were anxiously studying the details to see how their majorities would be affected.

The changes are intended to make the number of voters in constituencies more equal and slash the number of elected politicians.

Chris Skidmore, minister for the constitution, said the changes were needed because the gap between large and small constituencies had grown bigger.

“Equalising the size of constituencies in the Boundary Review will mean everyone’s vote will carry equal weight,” he added.

But Labour’s Emily Thornberry said it was unfair because 150,000 Londoners who joined the register of voters recently were being discounted.

“The boundary review process has been exposed as a gerrymandering sham,” she said. “The number of residents we represent in London is going up every year, and yet because many of them cannot register to vote, the population in constituencies like mine is deemed to be shrinking.”

The four boundary commissions for England, Scotland, Wales and Northern Ireland are announcing their initial proposals for changes to Commons constituencies this autumn.

They will be subject to a consultation, with MPs able to challenge the proposals. Nationally the number of MPs will fall from 650 to 600.

Jeremy Corbyn marked his first anniversary as Labour leader today with allies urging unity after the bruising leadership fight.

TUC general secretary Frances O’Grady appealed: “As soon as the contest is over, we are saying get behind whoever the leader is, get united. I think Labour needs to start focusing on what voters want.”

Mr Corbyn was due to meet union leaders over a dinner at the TUC in Brighton, to seek backing to purge critics from Labour HQ.