Yeah think you're right Davey now I've had a read. Sometimes they can move to another nest or get up for snacks mid hibernation...
I've been known to 'snack' at three in the morning but I won't go into that!..
SO might still be a hedgehog going back under the shed.
The one that we had under ours used to make very loud sniffing noises when active at night.
The tracks do look like a heavier mammal going by depth of tread.
Simon