Here at Pembrokeshire Hogspital, we have had three hedgehogs in already so the wild ones are waking up, as are some of ours. It is too early for them yet as their food has not truly surfaced so any hedgehog seen out now and especially during the day, needs to be picked up and cared for. Most will have lung worm anyway and that has to be treated or they will die.
Putting some food out for them can help. They need meaty not fishy food or dried cat food is alright and can be left out for several days. It is also possible to buy dry hedgehog food at Pets at Home. You need to be inventive about the feeding station so that passing cats and foxes cannot get at it. A little "house" made two bricks high and 2 bricks square with a piece of wood weighted down on top should be fine. Push the food to the back so a cat paw cannot reach it and hope for a hedgehog. If you do need to bring the hedgehog in, act fast and don't worry about the hedgehog flea as they are very rare now.