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Vile Owen, 41, also claimed he won £1,750 compensation after lags tried to poison his food.

And he told how he enjoyed “sexy ­sessions” with Tracey Connelly, the mother of 17-month-old victim Peter Connelly.

She was also caged for her part in the boy’s death.

Their sordid antics went on behind the back of her lover – Owen’s brute brother Steven Barker.

All three were jailed for causing or allowing Peter’s death ­after a string of attacks at a flat the three shared in ­Tottenham, north London. Barker is now serving a life sentence for raping a two-year-old girl.

Owen told ­Connelly, 32: ­“Remember we can never let him find out. That will break him.”

The letter was sent from his cushy cell at HMP ­Stafford.

Owen was freed in 2011 after serving half of his six-year stretch but he was back ­inside a year later for breaching his parole ­conditions.

The hated killer said he told fellow ­prisoners he was in for drug dealing and affray. He even bleached his hair in a bid to conceal his real identity.

But his cover was blown by a news story showing his face.

Unrepentant, Owen wrote: “They started on me spitting at me ­calling me a scumbag threatening to cut me up an punch me face in.

“People are so fickle living off the past it happened years ago I’m like get over it worse sh*t has happened since then.” Owen said he was eating microwave meals after allegedly being poisoned by canteen food.

He claimed to have won compensation for this but the Ministry of Justice said there was never a payout.

The ex-National Front member and convicted arsonist wrote: “Maybe they don’t want the people out there noing I got poisoned and I get big bucks if I do get poisoned again.

“I got £1750 last time ­partaaay ha.”

Owen asked Connelly, now serving out her sentence at Foston Hall prison in Derby, if she had received cash he sent her.

He signed off by saying: “My probation are trying to get me end for summer can’t wait yee ha partaaay.”

Guards protecting him have warned lags are ­desperate to “do him in”.

A source said: “He gets spat at and threatened all the time.

“But no one can go near him because he has screws watching over him.

“He’s an arrogant, dirty, child-killing ­bastard who has shown no remorse whatsoever.”

Baby Peter was tortured and left with 50 injuries including a broken back. Barker even set his rottweiler on him.

Slob Connelly allowed the beatings while she spent days drunk on vodka and watching porn.

She was given an indefinite sentence in 2009 but is now eligible for parole.

After the tot’s death in 2007 it emerged social workers, police and doctors had all missed warning signs that could have saved his life.