Theres been controversie about the dates of this hill figue and the Cerne Abbas Giant.
As far as i can tell no dating has been obtained from these figues.Only the surroundings looked at and dated.
The Uffington Horse was first cut in the Bronze age.Surely the same dating technique could be used on the other two to find out the exact dates.
I sometimes get the feeling that people are afraid to accept that something like this could last so long which would mean continuety,as in the local people keeping the figues clean.
This is what must have happened at Uffington.
Perhaps they are afraid to date them.
http://www.extra.rdg.ac.uk/news/details.asp?ID=257