I've been looking for a thread on this. It really calls to mind the Ian MacEwan story
The Innocent. There's a photo of the bag being carried out of the house on the BBC news page, and given the size of the bag you have to assume he's been dismembered (or was a midget, as gt3 suggests).
By the way, the
BBC page has a fantastic quote that tells you all you need to know about modern, "we're all in this together" Britain:
Jason Hollands, 41, a City worker, who also lives nearby, said: "It's truly gruesome - this is a very mixed area of bankers and politicians.