The body of Carol Morgan, 36, was found at Morgan's Store in Finch Crescent in Linslade, Bedfordshire, on 13 August 1981.

On Tuesday, a man and a woman in their 70s, from Brighton, East Sussex, were arrested by officers from the Bedfordshire, Cambridgeshire and Hertfordshire major crime unit on suspicion of conspiracy to murder.

Detective Superintendent Carl Foster, leading the investigation, said: "We launched a murder investigation into the cold case of Carol Morgan over five years ago.

"My team have worked relentlessly to piece together the events that led to her untimely death and have explored investigative opportunities available to us in the time that's passed since the 1980s.

"I want to thank our community for supporting the investigation.

"Our cold case unit continues to review every unsolved murder and no murder investigation is ever closed."

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A number of arrests were made at the time of Ms Morgan's death, and again in 2019, but no one has ever been charged.

Police have set up a web page for anyone with information about Ms Morgan's death.