NOTE: Yesterday, we published a version of this story under the headline: "Boundary review could see MP Gavin Barwell's 165-vote majority increased to more than 6,000"

The story was based on data from Electoral Calculus, which provides electoral forecasts for wards and constituencies based on previous election results and recent opinion polls.

This has now been amended and replaced with data from UK Polling Report from last year's election, which we believe gives a truer reflection of the impact of the proposed boundary changes.

The Boundary Commission has published its proposed changes to Croydon's three parliamentary constituencies.

Under the commission's draft recommendations, announced late on Monday, Tory-held Croydon Central would remain a marginal battleground between the Conservatives and Labour.

In last year's polls Gavin Barwell beat his Labour challenger Sarah Jones by only 165 votes to clinch re-election, a victory that later became the subject of the MP's recently published political memoir, "How To Win A Marginal Seat".

If the election had been contested under the proposed new boundaries, Mr Barwell's majority would have been reduced to 60, making Croydon Central the most marginal seat in the country.

The newly configured Croydon Central would absorb two safe Conservative wards from neighbouring Croydon South, while shedding the Labour-voting Woodside, Fieldway, and New Addington wards.

It would also gain the Labour stronghold of Broad Green from Croydon North, and lose the Conservative-dominated Shirley to neighbouring Bromley - shunting Mr Barwell's constituency office outside the borders of the newly configured seat.

The political make-up of the borough's two other seats are also set to remain largely the same, as the changes pose little threat to Mr Reed's Labour majority in Croydon North or Conservative Chris Philp in Croydon South.

In February the Boundary Commission announced it would be conducting a review of Parliamentary constituencies across the country, with the aim of reducing the number of MPs in the House of Commons from 650 to 600 and distributing voters equally across all constituencies.

But Monday's announcement prompted a wave of criticism from Labour MPs, whose party stands to lose 23 seats under the proposed changes - including divisive party leader Jeremy Corbyn - compared to 17 Conservative seats.

Mr Reed criticised the Boundary Commission for using electoral roll data from December 2015 as the basis for the review, which does not include an estimated two million who registered in the run-up to EU referendum in June.

He said: "I think the process is really about fixing the system to the advantage of the Tory party. The principle makes sense, but there are two million voters who are not being considered.

"[Also], in more disadvantaged areas you get a lot more people who don't get registered to vote, but they still use public services and are more likely to have complex needs.

"We know they are there, but they are not being taken into account.

“It's very disappointing and very undemocratic."

Mr Reed also said he planned to speak with constituents in Broad Green and Norbury to dicuss how the changes would affect them.

The Boundary Commission's final report is due to be published in 2018, following a consultation process on the draft proposals.

Last month Mr Barwell, who became Minister for Housing and Planning and Minister for London after Theresa May took control of Downing Street, said his future as an MP was "beyond my control" in respect of the boundary review.

He could not be contacted for comment today.

Got a story? Call the newsdesk on 020 8722 6388 or email daniel.omahony@newsquest.co.uk