Easily visible from the road, I'm surprised I've not noticed this one before. Parking in the farm driveway is possible without blocking access, so I risked it for a quick grab shot, as no-one was around though the weather was closing in.
SW430314 - Ian McNeil Cooke's 'Standing Stones of the Land's End' (1998 - Men-an-Tol Studio) says "one stone of a former pair set NE/SW about 10 feet apart in a field behind [Tremayne] Farm; examined by Dr.Borlase in 1752 who found a pit 'full of black earth' between the stones but no remains; the paired stone was destroyed about 1900". Stands 1.9m tall. On private land. Very close to the A3071.