Blackpool S00 E07 "Cupid" by Johnny Nash

Ripley Holden is a small-time entrepreneur desperate to make it big with his new state-of-the-art amusement arcade. The opening extravaganza is overshadowed by the find of a dead body on the premises. DI Carlisle is called in and quickly finds he has more on his mind than murder, when he falls in love with Ripley's long-suffering wife.