I've got an autumn juvenile that I just brought in. He weighs in at approx 470g when he should be at least 600g to survive hibernation.
He's currently safe in a pet carrier box with towels for warmth, a bowl of dogfood and another of water. The box has been placed in a warm, dark room. When I checked on him just now he was sleeping.
I'm planning on taking him in to a local rescue centre tomorrow. Sorry, no photos as yet (I've left my camera out in the car).