Sunday marked the ninth anniversary of the tragedy on February 23 2016 which cost the lives of Ken Cresswell, John Shaw, Michael Collings and Christopher Huxtable.

Thames Valley Police is still leading the probe alongside the Health and Safety Executive.

The force said it is “confident that we are moving towards the latter stages of our enquiries.”

Deputy Chief Constable Ben Snuggs said: “We today pay tribute to the four men who lost their lives following the partial collapse at Didcot Power Station and my thoughts remain with the families of Michael Collings, Ken Cresswell, Christopher Huxtable and John Shaw.

“Our dedicated joint investigation team continues to make meaningful progress in this highly complex case which is actively investigating offences of corporate manslaughter, gross negligence manslaughter and Health and Safety at Work Act offences.

“The scale of the investigation is almost unprecedented: To date, the investigation team has collated and analysed over 6,500 exhibits, 90,000 images, and 230,000 digital media artefacts. Over 180 hours of video recorded witness and suspect interviews have been conducted, in addition to the 2,812 statements taken.

“The investigation team also continues to conduct further interviews and, while we cannot put a specific timeframe on when the investigation will conclude, we are confident that we are moving towards the latter stages of our enquiries.

“Our officers continue to provide regular updates to the families on the investigation progress, as well as to the Crown Prosecution Service.

“We remain totally committed to investigating what happened at Didcot and providing the answers the families deserve. I want to thank them for their ongoing and unwavering support.”