I have a Baofeng GT3-MK3, a great little radio. Is it OK to use this on the low output setting for general use without a licence, for things like camping/hiking family use etc, if I used the legal frequencies, i.e. 446 in UK?
Unfortunately not in the eyes of Ofcom.
While you can restrict the power usage down to 0.5 Watts, the antenna is removable. You'll notice that most of the stuff sold on the high-street will have solid antennas.
For the PMR frequency use, as part of the "license-free agreement", apparatus in use must meet the high-street requirements.
Worth noting though, there's not a single Ofcom document out there that mentions removable antennas as a no-go, interpretation of the documentation and relevant citations is all we have to go on. It's a rather deep rabbit hole reading through all the linked PDF documents.
If that is the same as the Baofeng GT-3TP, the lowest power setting on that is 1.5 Watts, so officially not legal.
fixed antennas are not abligatory on pmr 446 anymore as long as they dont increase gain i was told personly by ofcom that so regardless of what anyone says its like the story of baofeng s not complying whole top and bottom of it is big companies dont like it so spread crap thats it