I've never been to that bunch a barrows (and didn't know they were there), though I'm back in Dorset for Xmas and I'm taking a few extra days to try and see things I havn't seen yet... No idea about pond barrows, soz..

Re. the Conquor Barrow.. I climbed over a barbed wire fence at the bottom of the housing estate (to the left of your picture) and walked up the side of the field coating myself in mud/clay. Assuming the entire mound is the barrow (I wasn't quite sure), it seems to be 80% in an accessable fanced enclosure (it has a gateish) & 20% in peoples back gardens.

Do you know what it is exactly? Is it actually a barrow or just a random neolithic mound?