National Car Parks offered a £1,000 reward for information about the killer of their attendant John Wortley, who was standing in for a sick workmate when he was battered to death near his kiosk at the Arundel Gate car park, Sheffield. It is still unclaimed.

Wortley, 66, lost his life on Thursday, June 5th, 1975, when his killer took the till contents of £59.

Clues: a wage slip was found nearby; a local dry cleaner noticed bloodstained clothing; an anonymous phone caller said two men were involved; a 20-year-old green Hillman Minx was parked in the car park but the driver was never traced.