From my own family's experience I can tell you they wont throw the book at him, it'll be a slap on the wrists and a paultry amount of jail time plus a ban.
There was a story a few years ago in the local rag about a guy who had worked that out and decided to use a car to kill someone that had upset him, but his plan was to down a half bottle of spirits while waiting for the cops to come & nick him after he had run his victim over.
His plan worked fine with the exception that the victim was crippled rather than killed and he was duly sentenced to a paltry 12 months with a couple of years ban to go with it, then with just a couple of weeks to go he starts bragging in prison about how easy it is to make a murder look like a drink/drive accident and to get no time at all for killing someone.
Despite the old saying, it would seem there is no honour among thieves as he was grassed up by another inmate and charged with attempted murder before he made it out of the gate for the original offence.
While I don't condone violence as a resolution to any given problem (it doesn't solve things anyway), I'll give the guy 10/10 for working out how to use the law to get bugger all for such a serious offence (and he gets 0/10 for posession of grey matter when engaging his mouth).