A rapist from Wembley who forced his victim into sex at least 20 times by threatening to send her mother explicit footage of them on WhatsApp has been jailed.

Imran Khan, 25, of Rosslyn Crescent, tricked his victim into performing oral sex on him by saying he would pay off her £2,000 debts.

The Old Bailey heard that Khan, who was unemployed and penniless, filmed her performing the act on his mobile phone and blackmailed her by threatening to post the footage to her mother using the messaging service.

He would pick up the victim, who was only 20 at the time, from her home and force her to perform oral sex in his car or orally rape her in the stairwell of her block of flats.

She said he had raped her on at least 20 occasions between January and May 2014.

Khan sent her more than 4,000 abusive and threatening text messages saying he would publish the footage unless she performed oral sex.

He agreed to wipe the video if she paid him £130, which she did, but just a few weeks later he got back in touch.

He told her the money had not lasted, he had not deleted the footage, and demanded she give him sex again.

Eventually she told a friend what was happening, who convinced her to go to the police.

Khan initially denied rape but changed his plea on the first day of his trial.

He pleaded guilty on the basis he had only raped his victim nine times.

Prosecutor Edmund Fowler told the court that Khan and his victim had met on Facebook, and had known each other for around two years before the attacks began.

Khan, who has a low IQ of 63, was jailed for six years.