Aye! Thanks all. I am walking right now and for snowfields I put the neoprene sock on top of merino sock and am comfortable. Wet but warm so I imagine that could do in brecons as well. I didnt take gtx sock just for the sake of testing out neoprene sock combo and must admit it works. I dont mind wet (they,'ll get wet inside gtx anyway) so its actualy working very good. Feet are pretty soaking wet but they are warm
Thanks to all who chimmed in.
Cheers.