An Oxford-educated investment banker who quoted Shakespeare as he sexually assaulted a woman has been jailed indefinitely.

His victim managed to call the police while his back was turned and officers recorded Paramasivam Sivasothy as he carried out the "brutal, ugly and repugnant" attack.

Southwark Crown Court was told that Sivasothy, 44, recited lines from Othello at the terrified woman before raping her.

A tape of the woman screaming in pain and begging to be left alone was played to the court yesterday.

Hannah Llewellyn-Waters, prosecuting, said: "He pushed her into the bedroom of her flat, and pushed her backwards on to the bed.

"She managed to get to the telephone and call 999 but the phone disconnected."

She managed to convince Sivasothy to leave the room briefly and was able to call the emergency services and give her address, then dropped the receiver when he came back. The operator recorded the call as police raced to the flat.

Sivasothy, from Southgate, north London, initially denied the allegations of rape, attempted rape and assault by penetration but admitted the charges in court.

Judge Deborah Taylor said they were "brutal, ugly and repugnant" offences. She ordered that Sivasothy serve a minimum of three years and 40 days before being considered for release.