Leo Hickman has unearthed a repository of DECC documents on climate change. I'm not clear if this is as a result of a FOI request or something else.
He is posting interesting snippets on his Twitter timeline. This internal briefing by a not-very-literate DECC insider is interesting.
[Update: author names are in the document properties. This one appears to be by P Munro; a google suggests P is for Paul]
It's an FOI request - the full response is here.