COVERT tapes which helped the conviction of the murderers of Johnston grandmother Betty Guy, will feature in ITV Wales’ Crime Files, returning to our screens on Monday, August 20.

Presenter Andrea Byrne will reveal the evidence from more of Wales’ most intriguing criminal cases and get exclusive access to police files and interviews with suspects.

For the first time in the series, Andrea gets an insight into how investigation teams use covert techniques to gather evidence.

The presenter listens to covert tapes from the murder case of Pembrokeshire grandmother Betty Guy.

84-year-old Betty Guy was murdered at her home in Johnston.

In the tapes, Betty’s daughter and grandson are heard discussing her killing at home.

Penelope John and Barry Rogers were both found guilty of murder in February 2018.

The programme reveals their custody interviews with detectives and how they both deny any responsibility for the death of the elderly pensioner.

“News reports often only reveal a certain amount about a case due to legal restrictions,” said Andrea.

“We report on the crime when it happens and then we report the trial and the result.

“What we don’t find out in detail is the intricate methods used by the police to crack the case and how they made their breakthrough.

“That’s why this series of Crime Files has been particularly fascinating. It’s giving us access to revealing police tapes and new forensic evidence.

“It’s a remarkable watch.”

In Monday’s 8pm episode, Andrea meets detectives in Port Talbot who faced a challenging case after the unexplained death of local girl Kellie Gillard in April 2015.

The September 17 episode will cover the Betty guy case.

Other cases in this, the third series include the murder of Barry teenager Conner Marshall in Porthcawl’s Trecco Bay in 2015 and the stabbing of Mark Mason from Rhyl in October 2016.

Another programme looks back to the infamous Moors Murders. It features a Welsh detective who is still haunted by the case after coming face to face with killers Ian Brady and Myra Hindley.