I called samsung support, they suggested a factory reset, this i did.
i then went to the nearby devices menu, it then let me enable the rest of menu then it greyed itself out! now it will not switch on or off again!!! hmmmmmmm
S3 Non Branded, UK, Three Network, Firmware LH1
didnt work in the previous firmware either! Mind LH1 was only a battery drain update so the web tells me.
third party app in my last post doesnt work either. or my tv will not detect it.
all fine on a HTC Sensation