GPSed. Found by ecologist Mark Wapstra. His ID is Agile cool-skink or Tasmanian tree skink (Carinascincus pretiosus). This seems to fit with the key ID features for Niveoscincus pretiosis (former name) in my copy of Wilson & Swan 2nd Edtn i.e. "..... SVL 57-70mm .... Dark olive brown to brown with a black narrow ventral stripe.... white midlateral stripe and grey lower flanks ......".