HE was an underworld gang leader who ran a multi-million-pound empire based on drugs, extortion and violent crime.
Born and bred on the Bestwood estate, Colin Gunn, with the help of brother David, built up a powerful crime network that resulted in some of the most high-profile crimes in Nottingham's history.
But from the confines of a top-security prison, his latest concern has been the cost of sending letters.
Gunn, serving 35 years for ordering the killing of Joan and John Stirland, wrote to prisoners' newspaper Inside Time about post room rules at HMP Belmarsh.
"I would like to inform all prisoners at Belmarsh that they have been overcharged by post-room staff when sending out A4-size mail and above, using a cash disbursement form," said Gunn, 45.
"A large letter which includes A4 and above has four different weights starting at 0-100gm for 90p and ending at 501-700gm for £2.30.
"Belmarsh have totally ignored these guidelines and have charged any A4 envelope as a 'packet' with a starting price of £2.70.
"When I raised this I was told I was wrong and an A4 letter is a packet! Unbelievable!
"They now concede I was in fact correct but what is worrying is how long this practice has been going on. Belmarsh were oblivious of their mistake. I suggest anyone with concerns should submit a Comp 1 (complaints form)."
Gunn even included a table showing fellow inmates exactly how much they should be paying for stamps, it was revealed.
His latest battle against prison staff follows claims in December that he could put the safety of officers at risk after winning the right to know what staff were writing about him in jail.
He urged other inmates to apply for their wing history sheet and other information held on them after a decision by the Prisons and Probation Ombudsman to uphold his complaint.
After Gunn's latest complaint, Glyn Travis, assistant secretary of the Prison Officers' Association, accused him of "trying to make himself infamous".
"Mr Gunn is residing where he should be – that's in prison," said Mr Travis.
"While he's been making lots of complaints he is entitled to do that and they then will be investigated thoroughly and lessons will be learned if mistakes have been made.
"One thing he will learn is that prison life can last a long time."
In 2010, Gunn wrote to Inside Time revealing he had won the right to be called "Mr" by prison officers.
He said he had complained to the Prisons and Probation Ombudsman about staff at HMP Whitemoor not using the formal title.
His complaint was upheld in December 2009.
Gunn, from Rise Park, was sentenced to life with a minimum term of 35 years in 2006.
Last June, the Post reported how Gunn was believed to be hatching a daring escape bid.
Officials were so worried that they moved him from HMP Long Lartin, in Worcestershire, to Belmarsh, in London.
Belmarsh holds up to 910 prisoners, including "Category A" prisoners – those whose escape, according to the Government, "would be highly dangerous to the public, police or the security of the state and the aim is to make escape impossible".
