I drove past this stone on February 15th 2008 and it was still standing then, but was reported as having fallen by March 8th 2008. So we went to check it out today... unfortunately the giant is indeed on his back.
(I've uploaded some pics).
I thought that the crop in the field looked like last autumn's sowing, so I doubt that it was knocked over by a tractor within those three weeks.
The stone didn't appear to have been deeply planted originally, judging by the shallow socket left in the earth. Also, there was a wider depression around the stone, much like the ones found when stock animals use a standing stone as a rubbing post.
Maybe a combination of constant rocking by stock in wet ground made it unstable, and the earthquake on the 27th February finished the job?!
Who's responsible for the stone? Is there a chance it will be re-erected?
Cheers
Dave