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I don't know much about hedgehogs but I know they move around a lot when they're not hibernating (and it's far too early for that). So if it doesn't move soon it might be injured but definitely make a house for it.
I haven't read all this but should give you the answers you need I think:
http://www.sttiggywinkles.org.uk/top-navigation/wildlife-advice/hedgehog-fact-sheet.htmlI'm envious - we have a terrible slug problem and hedgehogs love slugs.
Yes. Very easy to do, just use something like a wine crate. There's plenty of websites offering tips on how to build one. Give it hedgehog 'kerb appeal' and it'll move in, so fill it with small, dead leaves, put it in a quiet part of the garden, out the wind.