Weaver Vale was a new seat created in 1997 towards the west of the county from parts of Eddisbury, Warrington South, Tatton and Halton.
Weaver Vale was won for Labour by Mike Hall with a majority of over 13,000 votes in its first contest. Mike Hall was MP for Warrington South during the 1992-97 parliament, and chose to contest Weaver Vale because it was both a safer prospect and incorporated part of his original seat.
The constituency has an extremely varied landscape that includes industrial Northwich, the base for ICI, rural Helsby, popular with hill-walkers and rock-climbers, and affluent commuter towns like Hartford.
Salt-mining is the historic key to the seat's industry, and the presence of salt led to the establishment of the huge ICI works at Warrington which now makes products ranging from PVC to anti-knock chemicals for petrol.
The River Weaver was canalised in the eighteenth century to help transport salt, and Northwich is even home to a National Salt Museum. Salt, though, is not the only force in the local economy as tourism, agriculture and service industries also play a part.