A UK killer is getting married behind bars after being switched to a womens jail following a sex-change operation - and falling for a lesbian murderess.

The Sun reported Douglas Wakefield, 61, who was jailed 36 years ago for killing his uncle, has won permission to get hitched in the prison chapel of New Hall Prison near Wakefield, West Yorkshire.

Criminals will be guests at the civil partnership ceremony as Wakefield - who underwent a taxpayer-funded "gender reassignment" and is now called "Tai" - recites vows with mother-of-three Thelma Purchase, 45, a fellow killer serving a life sentence.

It follows another wedding earlier this month at the New Hall Prison - of killers Amanda Fitzpatrick and Debbie Ware.

Fitzpatrick, 25, was jailed for life for the murder of her brother-in-law with scissors and lesbian Ware, 31, stabbed a shopkeeper in a robbery.

Furious Tory MP, Philip Davies, blasted the prison nuptials.

"It is incredible this can be allowed. The criminal justice system is becoming a joke," he said.

Wakefield was jailed for strangling his uncle, beating him with a hammer and stabbing him 48 times with a garden fork in Gipton, Leeds.

The father-of-two became notorious as one of the most dangerous men in jail after killing an inmate at Parkhurst and twice taking prison officers hostage.

He has been married twice, once behind bars.

His £11,000 ($19,000) sex operation in the '90s came after he started wearing earrings and decorated his cell with lace curtains and flowers.

Wakefield was then transferred to New Hall, where Purchase began her life sentence two years ago.

Purchase was jailed for a minimum of 30 years after getting a job caring for a disabled man - who she suffocated to get her hands on £70,000 he left her in his will.

The pair must pay their £345 wedding costs out of money they have saved.

Read more about the sex-change killer marrying a lesbian murderess at The Sun