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Labour MPs have won a landslide vote to destroy a constituency boundary shake-up they claim is "Tory gerrymandering".

The review is set to cut the number of MPs from 650 to 600 using proposals by an independent commission.

Experts warn 15 more Labour than Tory seats will go and the review will airbrush out a huge surge of 2million newly-registered voters.

But Tory ministers are pressing on with the 'reform' anyway - despite stuffing more peers into the unelected House of Lords at the same time.

A Labour bid to scupper the review passed 253-37 today in the House of Commons while most Tories were away on constituency work.

But MPs will return for a second vote - and as long as there's no Tory rebellion, the party can have the last laugh.

Today's vote was a rare victory for a backbench 'Private Members' Bill' and only happened because Labour's flank of MPs turned up to the Commons debate.

Friday laws are usually "filibustered" out by renegade Tories or government ministers who give huge speeches.

But MPs can force a vote if 100 agree to one, and a motion to do so passed overwhelmingly by 257 to 35.

More than 60 opposition MPs were in the Commons chamber to support the Bill by Pat Glass, who is standing down at the next election.

"My motivation is not personal," she said. "I am moving this Bill because I want what is best for our democracy."

Shadow Cabinet Office minister Andrew Gwynne warned the "completely lopsided electoral register" meant the changes will benefit the Tories.

He added: "It cannot be democratic, fair or even competent to advance this review at the same time we are stuffing the [House of Lords] with unelected and often unprepared peers."

Tory MP Peter Bone backed the bid because he said his workload would be too big.

"The fact is if we're going to put more and more work on us because of the EU, and at the same time reduce the number of MPs, we won't do the scrutiny properly," he said.

"I'm afraid I think our service to our constituents will go down. And I feel quite passionately about that."

Labour MP Paul Flynn said: "The Mother of Parliaments is now sadly a dissolute degraded hag

"This proposal will make things worse."

Labour MP Mike Gapes said: "Just because a Coalition voted and railroaded through some changes a few years ago there is no need for this Parliament to carry on this stupid policy."

And Labour colleague Ian Murray said the shake-up was part of the Tories' "gerrymandering the constitution".

Tory David Nuttall hit back, however - claiming Labour MPs were trying to stop themselves from facing reselection.