A daughter who repeatedly battered her frail father over the head with an iron, spraying blood across his bedroom walls and ceiling, has been convicted of attempted murder.

Gillian Davey, 43, of Bourne Drive, Mitcham, struck Walter Davey, 80, with such force the iron smashed into more than a dozen pieces during the attack in March last year.

An Old Bailey jury heard how the defendant blamed her father for her mother’s death years earlier, prompting the drug and alcohol-fuelled attack in Walworth, south-east London.

Davey was convicted on Thursday but will not be sentenced until next month as the judge awaits psychiatric reports.

The court heard how the former paramedic had been on a drinking binge with her brother, consuming up to 10 pints of beer, multiple whiskeys and taking cocaine, before launching into the attack just after midnight.

Jury members heard the victim screaming in the background during a 999 call made by the brother in which he shouted: “My sister, my sister’s attacking my dad.”

Davey crouched in the dock with her hands clasped over her ears during the recording.

The prosecution described the scene as something out a horror film before London’s leading forensic scientist Anthony Larkin showed the jury more than 60 images of blood stains taken at the scene.

He said blood was sent flying over furniture and even an England football shirt hanging on the bedroom door indicating blows continued to rein down on the victim as he crawled across the floor.

During an interview the next day, Davey told police: “I feel like I should be sorry but there’s nothing there, I know what I’ve done.”

Investigating officer, Detective Constable Mike Shaw, said: “This was a horrific incident and a tragedy for the whole family. Despite the verdict there are no winners because of the horrific nature of what happened.”

Mr Davey has recovered but is unable to remember the attack and has been left with permanent scarring.