We're in the dead zone now as regards vole-watching. I don't expect to see much in the way of field signs till February, and no actual sightings of animals till the end of that month or even March/April. I worry, too, about the amount of rain that's come down lately, in case some of the burrows have been compromised and the voles made vulnerable.
However, we've had very wet winters before and the colonies always do seem to come back, so I'm just crossing my fingers as usual and counting the days till the spring. We're not too far away now.
In the meantime, let me direct you to Terry Whittaker's gorgeous blog, and remind you that his water vole photography workshops will be running in 2013.