A pensioner, her son and grandson were mistakenly arrested on suspicion of murdering Gaia Pope as a result of a CCTV mix-up caused by the clocks changing, it has been alleged.

Rosemary Dinch, 71, Paul Elsey, 49, and 19-year-old Nathan Elsey were held as police and volunteers searched for Miss Pope, 19, from Swanage, Dorset, who vanished on November 7.

Mrs Dinch and her grandson were arrested six days after Miss Pope disappeared and were released the following day as police carried on their investigation.

Her son was arrested on November 16 and released under police investigation a day later.

Miss Pope's body was found on November 18 and police said a post-mortem examination had not identified any injuries to suggest third-party involvement in her death, which was being treated as "unexplained".