There were several plants in the area, but only two had flowers partially open. One of the plants that had an open flower was missing the hair tufts and post-anther lobe. The bigger plants in the area looked like they had self-pollinated and the flowers had not opened.
Rob with that thin channeled leaf and that hooded post-anther lobe, notched but not grooved, this looks like T. pauciflora. I am assuming it is a small flower c. 20 mm?