I've always thought of pike as mid-afternoon feeders, they don't get up that early and they're pretty efficient once they get started.
In my experience on a winter's day the best time is just after lunch until an hour before dark - we all fish that magic hour into dark - it works for other species but pike are done (they are off doing secret pike stuff).
A week or so ago me and James hit the river well after dark (to be honest you couldn't fish here during the day it would be far too busy). And float-wobbled deadbaits did the trick, three pike landed - no doubles but they're in here...
The water is gin-clear and the river is very well lit, are the pike hunting the silhouettes? We'll need to get back for a couple more rounds to find out.