You need to weigh the little hog. It needs to weigh at least 450g to survive hibernation. Not easy to estimate a hogs weight without weighing it. But it may have other problems as well. So the best thing to do is ring BHPS 01584 890801 to find contact details of your nearest carers. Then ring them and take their advice. In the meantime, continue to leave food and water available to the little hog.
Not ideal timing, but hopefully there will still be someone checking on phone calls.