"There are actually quite a few of us Mumsnetters who live in places with warm Christmases."
OK. I will rephrase that to "at this time of year in the chilly north of England who is going to see it?*
In the short time that OH and DD see my feet in winter, the fact that the nails are painted or not just will not register with them at all. In fact, I don't think that OH notices whether my nails are painted in the summer.