A KILLER who says his jail cell was too chilly is leading a human rights claim which could cost taxpayers nearly £1million.
Barry Hillman, 42, reckons dodgy central heating and a lack of hot water breached rights set by European laws.
The convicted murderer and rapist is among 29 lags seeking compensation — despite being given portable heaters, hot water bottles, thermal underwear, duvets and soup to help them keep warm.
They cons claim they suffered “extreme bodily discomfort” and inhuman or degrading treatment at HMP Littlehey, Cambs.
They say the cold — at its worst in 2018 — stopped them washing, leading to hygiene issues and illness.
Hillman — jailed in 2002 for battering to death a pizza delivery man and for rape while on leave from prison in 2012 — is one of four test case claimants.
Lawyers say it could end in payouts of up to £30,000 each — with 25 more claims ready to go if they win.
The Ministry of Justice insists everything possible was done to address the discomfort and will fight the claims at Central London county court on a date to be fixed.