'Treebeardish' ... what a wonderful word; it does in itself sound like an ancient site. I understand from previous posts that this elder tree has proved hard to thwart, cut it back and it just grows stronger than ever. I would imagine that removing it completely would mean disturbing the stones.
Thanks Scubi, (also Rhiannon for mentioning it recently) you were definitely the inspiration for me going there. The late afternoon light was lovely, I took some photos that show the unripe maze crop shining in the sunlight, didn't want to post too many photos though as there are already some superb images for the barrow.