Page last updated at 15:39 GMT, Thursday, 25 March 2010

Boundary changes

Most constituencies will be fought on new boundaries at the 2010 general election.

These changes will not affect Scotland where new boundaries came into effect in the 2005 election.

The number of seats in the House of Commons will increase from 646 to 650. This means that one party will need 326 seats to hold an absolute majority.

Since the last election, 478 of 533 seats in England, 22 of the 40 in Wales and all 18 constituencies in Northern Ireland will have new boundaries.

The boundary changes are designed to balance the electorate in each seat. They are based on the findings of the Boundary Commission which reviews constituencies every 8 to 12 years to ensure that they represent population patterns.

In order to make fair comparisons with 2005, there are "notional" results, worked out by polling experts, which estimate the votes for each party in each new seat as if it had existed in 2005.



Print Sponsor



MOST POPULAR ELECTION STORIES NOW
ELECTION FEATURES, VIEWS, ANALYSIS
But now comes the difficult part - making it work
Why has Eton College produced 18 British PMs?
Frantic talks on who will form the next government

BBC navigation

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.

Americas Africa Europe Middle East South Asia Asia Pacific