Historically in Lancashire, it lies south of Culcheth and is historically part of the parish of Croft. During the Second World War it was the location of a Royal Ordnance Factory, ROF Risley. After the war it became the site of the design offices and laboratories for the United Kingdom's nuclear weapons and nuclear power programmes. Universities Research Reactor was operational in Risley until 1991. Today the bulk of the area forms the new town of Birchwood.
- for Risley, Warrington
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