Bother.
I've just discovered that the maddening itching of two of my toes (both fourth toes, counting out from the big toe) is probably chillblains.
This makes the problem of how to keep my feet warm trickier. In winter, as previously noted, I tend to do a 10k in the morning (to work) then a 25+km in the evening. With 700+m of ascent, that evening run can end up being a fairly slow pace, and my feet get cold and wet.
Easy: waterproof socks, Sealskinz do good ones.
Which don't fit inside my running shoes.
Get bigger running shoes.
Vivobarefoot don't make bigger running shoes than the ones I currently have. Neither do Inov8, in the ones I want.
Get waterproof running shoes.
Makes no odds when the water/bog is above the ankle.
Get other, bigger running shoes.
Possible, but the wait for size 48 shoes can be prolonged. I may have to go the Inov8 & Sealskinz route though, which is annoying as I much prefer running in fully barefoot shoes.