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How likely is it that he will be able to keep it?
Whether or not he'd be allowed to keep it probably revolves around what the agreements were signed regarding artifacts, before they started digging. Since an archaeological society was funding the dig site the kids were helping out at via funds raised through the National Lottery, I doubt the agreements would include entitling the finders to keep anything they find. All the finds, including the coin, probably go to the museum.
Besides, as a member of a "young archaeologist's club", he probably wouldn't want to keep it.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis