Stonehenge carried by Ice?

It has been accepted wisdom for so long that the ancient stones of Stonehenge were dragged and rafted there by human action from the Precelli Hills in South Wales, an amazing task even with today's technology. A new theory emerges stating that the stones had been carried to the area by the natural action of glaciers then trimmed thousands of years later by the ancient British. I wouldn't like to bet on either theory, but what else is there? ;-)
Have a look at the BBC link.