Parliamentary constituency boundaries are revised regularly to take account of population changes. A major review has begun which will reduce the number of constituencies before the General Election in 2015.
Until the 1983 General Election, Crewe and Nantwich were in separate constituencies. Since then the boundaries of the Crewe & Nantwich constituency have changed several times. For the most recent elections, the constituency has comprised the two towns and the suburban villages surrounding them. There was a notable by-election in the constituency in 2008, following the death of the long serving and widely respected Labour M.P. Gywneth Dunwoody. The Conservatives won the seat for the first time and retained it at the 2010 General Election.