I think they found lots of bluestone chippings at stonehenge though (don't quote me on that), proving that they were worked there. It's interesting that another's turned up in a nother place. Though it is only inches across. Could have just been shoved in a pocket (like I'm sure many of us carry round odd bits of stone and stuff we've found)? In fact, lots of stones (at stonehenge, the rollrights) have been hammered at over the years for souvenirs. I've got a big bit of stone from Cumbria that's the same sort as the axes from there. Like a little connection. I'm not sure what significance you can put on the new find?? The supposed one at Boles barrow was a hulking great thing.
Anyway more info required from somewhere or other I suppose