Burl's main argument seems to be against the use of rafts for a sea and river journey.

I agree with this, almost impossible.

But why discount the use of a real wooden boat? the Northferribee boat has now been redated as 3000 years old.

Is it possible that such craft might have been in use at the time the Bluestones were moved?

With such a craft as few as 8 men (the Northferribee boat would have held such a crew and a stone) could travel to Wales and using stone-rowing techniques move a stone to the beach and load it into the boat.