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The government has abandoned plans to reduce the number of MPs from 650 to 600.
Cabinet Minister Chloe Smith said the move was necessary because Brexit would result in Parliament having a "larger workload" in the future.
The plans to reduce the number of MPs were an integral part of David Cameron's election manifesto in 2010 and were also included in the government program of the Tory-Lib Dem coalition.
Mr. Cameron said it would reduce Parliament's costs and offset the size of constituencies.
Parliament approved the plan in 2011, but the move was repeatedly delayed due to disputes over which seats would be canceled.
In a written statement to Parliament on Tuesday, Ms. Smith said: "Legislation currently provides that if the 2018 Border Verification Recommendations are implemented, the number of constituencies in the UK will be 600.
"Instead, the government is trying to ensure that the number of constituencies remains at 650.
"It would also remove the legal obligation to implement the 2018 border review recommendations and the government's legal obligation to take precautions to review the electoral reduction to 600 by November 30, 2020."
The minister added: "The UK Parliament will have a bigger workload once we regain control and regain our political and economic independence.
"It therefore makes sense that the number of constituencies remains at 650."
The move was greeted by activists.
Darren Hughes, director general of the electoral reform company, said: "Plans to reduce voter representation in the lower house would have undermined ordinary people's votes in parliament and violated democratic control.
"The proposals always seemed to be a takeover by the executive rather than a real step towards improving the function of the Commons. So this is a small but welcome victory for backers and voters.
"Once the pandemic is over, we need a fundamental reform of how our democracy works in Britain.
"We need adequate principles to underpin how many Members we have, how borders are drawn and how the franchise works. It is time to move from ad hoc partiality to real democracy.
"Without reducing the size of the government, dismantling MPs would have done little more than strengthen the already disproportionate power of ministers."