Ian Mortimer has recently added an article on the alleged death of Edward II to his website. Please, please read it!! Even if you're really sceptical about Edward's survival after 1327 - especially if you are - give it a read. You might be surprised that what you've always 'known' to be true isn't! If you can, read Dr Mortimer's biography of Edward III, The Perfect King, which goes into all this in more detail, or at least read this article. If you can get hold of English Historical Review, he's written a great piece, 'The Death of Edward II in Berkeley Castle', volume 120, number 489, from 2005. There's an abstract here.
And if you're in the mood to learn more about the oddities surrounding Edward's death, I've written a few posts on the subject, collected in the sidebar on the left under the heading 'Aftermath of Edward II's Reign'.
Over 1000 people have voted in my poll 'What happened to Edward II in September 1327?'. Fully 28% of you believe in some version other than the traditionally accepted one that Edward was murdered in Berkeley Castle in September 1327. And belief in the 'red-hot poker' story is down to 57%, which I'm really pleased about, considering that it's still often depicted as a certain fact, in published books and about nine zillion websites. A very heartening result.