A TRANS killer in an Edinburgh nick has been given the go-ahead to have gender reassignment op - paid for by the NHS.

Paris Green, who was born Peter Laing but identifies as a woman, has been on a waiting list for the procedure.

2 Green was allowed to live in the women’s wing while she awaits a sex change op

Jail bosses allowed her to live in the women’s wing of HMP Edinburgh while she waited for her reassignment surgery.

But the sick killer – who helped torture somebody to death after a row over a bag of chips – was found to be having sex with female lags.

Green has now been given the go-ahead for the op - with prison officers describing the move as a “security nightmare”.

The Times reports Green will be escorted on a 1,000-mile round-trip from jail to a hospital in the south of England.

She'll undergo the op under a 24-hour guard and have a period of recovery lasting up to two weeks.

2 Green was moved back to the men’s wing at HMP Edinburgh, pictured Credit: Alamy

And it's reported that the process will cost tens of thousands of pounds.

It's understood that the op will go ahead within weeks.

She will be the first serving con in Scotland to undergo the surgery.

But prison officers have raised fears that the decision sent out the wrong message to victims of serious crime.

One officer said: “Most of the people I’ve discussed this with think it’s outrageous.

"You can murder someone brutally but while you’re in prison you’re entitled to everything you ask for, no matter the burden you put on a stretched system, because it might breach your human rights to say no.

“What about the rights of the victim and his family?

"Is anyone thinking of them? Is it not another slap in the face they could do without?”

Another officer said: “This will be a logistical and security nightmare for the prison service and for the health service, and they have more important things to worry about.

“This is not a life-saving operation. It is not vital to keep Green healthy. If you’re serving life for murder, I think some things should be outside your reach and this is one of them.”

Andy Hogg, of the Prison Officers’ Association Scotland, said: “We do not make the rules, we don’t comment on them and we don’t decide who goes to jail or when they get out.

"We just carry out our duties with professionalism and humanity.”

In January 2017, screws were forced to send her back to the men’s wing when she ignored them and kept hooking up with her fellow prisoners.

In 2013 she was moved from Corton Vale women’s prison, near Stirling, after reports of “inappropriate behaviour” with women at the jail.

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She was jailed for a minimum of 18 years in 2013 for her part in the brutal murder of Robert Shankland, 46, in Glenrothes, Fife.

Green and two pals lured their victim back to a flat before tying him up and battering him to death after sexually assaulting him with a rolling pin.

A spokesman for the Scottish Prison Service said: “We cannot discuss individual cases but if a request is made by the NHS for surgery for one of the prisoners it is treating, we would not and could not stand in the way.”

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