Two lesbian lovers have been jailed for life after bludgeoning a British girl to death in Australia because they found her “annoying.”

Jessica Stasinowsky, 21 and Valerie Parashumti, 19, pleaded guilty to murdering 16-year old Stacey Mitchell, whose family had moved to Australia from West Moors, Dorset in 2001.

The court was told that the two women became sexually aroused as they beat the teenager with a concrete block and made a mobile phone video of the murder scene before dumping her body upside down in a bin in a back shed.

A psychologist found that Parashumti, who drank blood as part of a vampire subculture, had strong sexual sadistic tendencies.

Judge Peter Blaxell handed down the life sentences, with a minimum of 24 years to be served.

“You have each had more than a year in custody to reflect upon the evilness of your crime, yet you still lack remorse and obviously place no value on the sanctity of human life,” he said, according to ITN.com.

“Even more appalling are your admissions to the effect that at the time of the murder you were each sexually excited by the violence of the event.”

The court heard that Stasinowsky became jealous when Mitchell moved into a house the lovers were sharing, believing that the teenager was flirting with her partner.

Parashumti expressed the need to prove that Mitchell meant nothing to her, so the couple agreed to murder her.

All three drank whiskey and Mitchell took tablets which made her drowsy before Parashumti approached the teenager from behind and started hitting her on the head, while Stasinowsky took off a dog chain belt and began to strangle her.

Parashumti and Stasinowsky will be housed in separate units at Bandyup Women’s Prison, the only corrective services facility for women in Western Australia that can cater for maximum security prisoners.

Corrective Services Minister Margaret Quirk says that she can not guarantee the couple will not contact each other while in jail but has asked corrective staff to ensure that possible opportunities for communication are kept to a minimum.

“It would be preferable to keep them entirely separate from each other and in an ideal world this would be possible,” she told perthnow.com

“To that extent I have directed they be kept in different units from each other. They do not now, and will not in future, share a cell with each other and will continue to have, minimal opportunity for any kind of contact.

“That said, it cannot be guaranteed they will have no contact – for example they may have incidental opportunities to speak to each other in situations such as meal times or exercise periods.”