I would be inclined to look for a venue where the fish see some bait all year, that way they still have some incentive to feed.
I was on one of linear's waters last autumn and one of the bailiffs was hypothesising about the way the carp's behaviour had seemed to change in the autumn... so whereas a few years back, the fish would feed quite hard in autumn (because the winter would be a period with much less natural food available), now they would not bother so much because the waters are fished all year round and bait is always available to them. And they're getting caught too. So if the fishery is still seeing some bait going in, chances are the carp will still be feeding, albeit less enthusiastically than in summer.
That said, the one tip I'd offer is don't ignore bread as a bait during the winter. It doesn't have the richness of some other baits and might be a bit more appealing during the winter months, plus the small fish activity is much less (so they're not smashing it to pieces the way they would be in summer)