What Mr. Famous is neglecting to tell you is that this punk was, in fact, threatening Mr. Martin with a crowbar. The first shot winged the little bastard in the legs and also wounded his companion, who then escaped through a window. The Kid whom Martin killed then reached for his crowbar and was in the process of rising to his feet when Martin shot him a second time, this time in the head and neck, killing him instantly.
He is also not telling you that the reason Mr. Martin was denied the "Self-defense" excuse is because he used an "Offensive Weapon." BTW, in England, a kitchen knife is considered an Offensive Weapon, because of the fixed nature and length of it's blade.
Martin was denied parole because, in the words of Home Sec. Jack Straw ( paraphrasing here ) "burglars are people as well, who require protection from dangerous people like Mr. Martin here." This was the opinion held by the majority of the parole board, as well.
To get the whole story, check out
www.keepandbeararms.com, with it's archived reports from the BBC and various US sources. I would strongly encourage Mr. Famous to do the same, assuming Her Majesty's Govornment still allowes British Subjects to view such websites.
BTW, "barbed wire around your house" refers to putting it atop one's garden wall, not at street-level.