In reply to ClimberEd:
Yes, I only wear one thin pair of socks nowadays.
I was forced into it as boots seem to have a narrower toe box than in days of old. I already take a 48 / 12 so am at the top end of most ranges so cannot normally get a bigger size off the shelf.
Boots have evolved other the years, to include some insulation in mountaineering boots so I assume that two pairs of thick socks is probably now a bit obsolete so whilst I was forced into the decision, I don't think it is a problem.