Fifth periodic review of Westminster constituencies

The fifth periodic review of Westminster constituencies was undertaken between 2000 and 2007 by the four boundary commissions for England, Scotland, Wales and Northern Ireland for the UK Parliament. The changes for England, Wales and Northern Ireland took effect at the 2010 general election; that for Scotland took effect at the 2005 election. Changes were also made to the constituencies and electoral regions of the then National Assembly for Wales (now the Senedd), and took effect at the 2007 Assembly election. All of the recommendations were approved.