The general election will be fought without long-promised boundary changes intended to cut the number of MPs in the House of Commons coming into force.
MPs had been expected to approve changes to the size of the House of Commons in September this year ahead of their introduction ahead of the expected 2020 election.
The changes would have cut the number of MPs to 600 and ensured that all constituencies broadly have the same number of constituents in each one.
However the early election means that the changes will have reintroduced after the election and introduced at the 2022 election, or dropped altogether.
More likely now is that a policy to equalise the size of the 650 constituencies – but not cut them to 600 - will be adopted in the Conservative party’s manifesto.
One senior Tory MP said: “There is a huge question-mark now over whether the boundary changes will ever happen. The earliest they can come in 2022 after a five year Parliament.”
Theresa May, the Prime Minister, had already faced a battle over the changes with only a slim majority in the Commons because of opposition from Labour MPs and some Tory MPs.
The MP said: “The boundaries were never that popular and there was a big question with Brexit whether it was wise to reduce the size of the Commons from 650 to 600 given that the Lords keeps increasing.”
Another senior Tory said that it would be “sensible” if another review was carried out by the Boundaries Commission to take into account more changes in population figures.
Mrs May’s predecessor David Cameron told every Conservative MP last year that they will be guaranteed a seat to fight at the 2020 election after unrest about the changes.
Downing Street has made clear to every sitting Tory MP that "no colleague will be left behind" following threats of a major rebellion over the boundary reforms.
The move was seen as an olive branch to Eurosceptic Tory MPs preparing to campaign for exit from the European Union in the upcoming referendum.