The BP petrol station on Warrington Road in Culcheth was targeted during an armed robbery. Picture by Google Maps. A MEMBER of staff was injured after a robber armed with a hammer raid a petrol station. The BP petrol station on Warrington Road in Culcheth was targeted during a robbery shortly after 6.30pm on Wednesday, January 6. Detectives say a man who was believed to be in possession of a hammer entered the store and ran towards a shop worker near to the till. He grabbed the till before fleeing the premises, with the victim having suffered minor injuries during the incident.