A Hounslow police officer, recorded raping a woman who had installed a sleep app on her mobile phone, has been convicted of multiple rape charges.

During the trial of PC Michael Graham at the Old Bailey , jurors heard how the 49-year-old tied up his victim, slapped and choked her during a series of sex attacks on his houseboat in Uxbridge .

He stood shoulders hunched and hands clasped as he was convicted of seven counts of rape and one count of sexual assault by a jury of six men and women on Thursday (June 16).

Graham of Croft Gardens in Poole was also acquitted on two multiple incident counts of rape where he was said to have raped the complainant on at least 10 occasions for each count.

Audio recordings of two attacks during which he said he would end up killing the woman and called her a ‘slut’ and ‘c**t’ were heard on the victim’s iPhone and played in court.

But Graham, who has been suspended from the force, insisted her repeated screams and shouts of ‘No’ were just part of their sexual fantasies and role playing.

The court heard how the sex attacks took place over nine months from December 24 2013.

The woman claimed if she went to the police, Graham would tell people she is “mad” but she finally decided to make a statement in September 2014 after he made repeated deaths threats.

'I'm going to beat you to death in a minute'

The victim told officers she was “absolutely terrified of him” and had installed the sleep app - activated by sound - initially because he snored loudly in bed, but later started using it to capture the aggressive rants and sex attacks.

During the recording the woman cries out in pain and repeatedly tells him ‘no’ and ‘don’t hurt me’ to which Graham replies ‘I like hurting you.’

Later he says: ‘I am going to beat you to death in a minute; I can see it coming.’

After being played the recordings, he said it ‘appeared bad’ but insisted that was how they had sex.

Jurors were told Graham became increasingly violent and aggressive after giving up cigarettes and using the drug Champix.

Prosecutor Eloise Marshall said Graham ‘would repeatedly cross the line from rough sex into rape’ and tell the victim that she needed to be ‘punished’.

She added: “It’s plain from the recordings that at the time the sexual assaults are taking place he’s hurting her, she doesn’t want him to carry out those acts.

“We say he knew she wasn’t consenting, he knew she didn’t want him to do those things but he carried on regardless - using her fear and her submission for his own ends.”

Graham denied nine counts of rape and one count of sexual assault relating to strangling the complainant and is due to be sentenced at the same court.