This diminutive plant (this photo is more than twice the real size) occurs in the acid bogs amongst the Sphagnum moss, and is in flower through July and early August.
These photos are from Winfrith Heath, I understand that they have also been seen in the boggy area east of Oakers Wood, and they have been found at Studland Heath north of Swanage.
July 2006.
This picture gives an idea of the size of this tiny little orchid.