In the UK, there are 650 parliamentary constituencies. Each constituency is represented by one Member of Parliament (MP) in the House of Commons.

Every five years, the population of each constituency vote for a candidate to be their MP. This person will represent the interests of the local population.

In November 2022, the Boundary Commissions of England and Scotland published their final proposals for the composition of parliamentary constituencies in the two countries. As a result, the constituency boundaries in the UK changed as follows:

• England – increase from 533 to 543
• Scotland – decrease from 59 to 57
• Wales – decrease from 40 to 32
• Northern Ireland – remains at 18

Only 57 constituencies across England (11% of the total) remain completely unchanged. The others have either:

• Had new boundaries while retaining their current name
• Changed their name but not their boundaries
• Or undergone both a name and boundary change.

Under the Parliamentary Constituencies Act 1986, and the modifications of the Parliamentary Constituencies Act 2020, every constituency must have an electorate that is within 5% of the UK electoral quota. For 2023 the quota is 73,393, which means no constituency can have fewer than 69,724 electors and no more than 77,062.

The 2024 General Election on the 4th July was the first time that the new constituencies were contested.