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During production, the actor even chatted with Bronson over the phone, before eventually meeting him. Obviously it paid off, because Charlie was impressed with his performance.
His son, George Bamby, told LADbible: "He's seen the film, and he thought it was absolutely brilliant. He thought Tom Hardy did a good job and portrayed him well.
"But, the funny thing is, when I go in to see him in prison, the amount of screws that have said to me 'have you seen that film about your dad, Bronson?'"
"I go 'yeah' and they say, 'well, you saw him in the film and saw Tom play him in the film, times that by 20 and that's what your dad is really like in a fight'.
"The screws say that the film Bronson made him look a bit of a pansy, because he's like 20 times harder than that.
"They've even said to me that even when there was a group of 12 of them that used to go into his cell when he was kicking off and they'd still s*** themselves even though there was 12 of them."
Despite his violent past, Bamby asserted that his dad - who identified him on a Channel 4 TV show a few years back, before confirming their relationship with a DNA test - is now a changed man, and he hopes that he could be freed in the very near future.
Bamby continued: "He is past all that thankfully, all he wants to do is live a peaceful life.
"He's ripped the roof of a load of prisons, he's caused untold s*** wherever he's gone, he's taken hostages, and done some bad things in the past which he knows about, but he's behaved himself for the past 10 years.
"There are so many people in the Ministry of Justice that use him as a trophy, to say to people 'if you don't behave, that's what will happen to you'."
"The prison service have held him hostage. He'll be the first one to admit that he's been a bad boy, he's done some nasty things, but a lot of them have been out of frustration.
"They've created a monster, and now they've created that monster they don't know what to do with it, and for the last 10 years, Charlie has rehabilitated himself."
If he is released on parole, Charlie will spend his days living in a caravan, doing his painting, and continuing with his physical training.
He's even managed to secure a job working in the Crime Museum in Torquay.
After his years of imprisonment and excitement, it's time for him to settle down and enjoy his remaining years living a quiet life.
Bamby added: He's a changed man. What people don't realise is that he's 68-years-old. He's technically an old age pensioner.
"All he wants to do these days is his artwork - concentrate on his art - he does a lot of stuff for charity, he's got a website set up where we sell loads of his limited edition prints, and so much money from there goes to charities.
"People don't really see that side of him, all they see is the film Bronson and the stuff that they read in the paper about some raving mad lunatic.
"Don't get me wrong, he's 68 but he's still hard as an ox. He's quietened down and he's very calm these days, but you wouldn't want to take him on with five of your mates, because he'd sit the six of you on you're a***.
"He trains every day, apart from Sunday, does 3,000 press-ups each day, does all his dips and running in the exercise yard, sit-ups and star jumps - he does 1,500 press-ups before he gets out of bed!"
"He knows that if he gets out of prison, and he gets that one opportunity, he walks into a shop and steals a Mars bar he'd be straight back in prison.
"He's safe in the knowledge that if he ever gets out, the Ministry of Justice have done their job now, they know that he won't say boo to a f***ing goose, because if he ever gets recalled back to prison he will never ever get out again."
If you're interested in buying one of Charlie's prints - and why wouldn't you be? - you can grab one over at his website.
Featured Image Credit: George Bamby/Vertigo Films
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