The resulting scene of the devastation resembled a bomb site and in some senses it was. It was in effect a bomb that you created and detonated.
As a result of your reckless actions you have caused the death of Jamie. You have taken away his life and a large part of his parents and siblings' lives.
The judge accepted it appeared that Partington had a change of heart in blowing up the house when he woke up the next day but said lighting a cigarette was "highly reckless".
"You were aware of the risk but you chose unreasonably to take that risk."
More top news
A hacker group who claimed to be behind a cyber attack on Sony Pictures have posted a message online apparently mocking the FBI.
The returns of Benedict Cumberbatch's detective and the X Factor judge were among 2014's most tweeted TV moments in a billion conversations.
A family has issued an appeal to help find their missing pet turkey - in case he gets gobbled up as someone's Christmas dinner.