I visited this site again today, the more I look at it the less convinced I am about it being a hillfort. For one thing it’s not on much of a hill, I know that doesn’t rule it out, but it would be very unusual in Dorset. Also the banks look far too insubstantial for defensive use. I don’t see any reason why it shouldn’t have been an enclosure for animals, this is an area of very good grazing for livestock. I’m more than happy to be wrong about this but, as Moss says it is unique in the Wessex area.