Tania’s mother, Kerry, said: “At least he is alive and can do things like watch TV and eat food. None of the girls can do that.

“If we still had the death penalty like we did years ago, he would not be alive and he would not have a chance to say what he said in the letter.

“I think he is feeling sorry for himself because with a bit of luck he will never get out.”

Paula’s father, Brian, said: “Let him rot in hell. How can he say that he is innocent when there is so much evidence against him? 

“It has turned my stomach. My heart goes out to the families of the other murdered girls because we can never replace our loved ones. He can do what he wants. He has hobbies and a TV and the gym and meals every day. They live the life of Riley.”

Wright committed the murders over a six-week period in the run-up to Christmas 2006, when the girls – all drug addicts – were working the streets of Ipswich. He would drop Pam off at work in the evening before cruising the town’s red light district in his car looking for victims.

Wright, who was obsessed with prostitutes, had sex with them, strangled them, then dumped their naked bodies in remote countryside outside the town,  Ipswich Crown Court heard.

But from Long Lartin Prison, Worcs, Wright insisted he did not have “a violent bone in my body” and said he was planning a second appeal, following an unsuccessful one last month.

He said: “I just know in my heart that one day my innocence will be proved and I will be able to go home to try and rebuild my life, wherever that home may be.”

He also had a chilling message for the people of Suffolk.

“What I would say to the people of Suffolk is be on your guard because the real killer is still out there. Although the injustice that has been done to me, I feel no malice or contempt for the people of Suffolk and for the families of the five girls that were cruelly taken away from them.

“I feel sorrow and heartfelt pain for their loss, with me being arrested for these crimes it gave them someone to vent their anger at. I completely understand but believe me when I say he is still out there contemplating his next move.”

Wright said he did not expect to be convicted and insisted prison was “no holiday camp”.

However, he admitted having a television in his cell, a job in the prison woodwork shop and a place on maths and computer courses. He also has access to the prison gym.

The killer ended his letter by reiterating his ambition to be reunited with his girlfriend. He said: “ I will always fight to prove my innocence because I truly believe that one day I will be with the woman that I love, Pam.”