As I mentioned above, the "Calais Packet" tune as given in "Robinson Crusoe" is the Welsh song "Hunting the Hare". For what it's worth, Jon Boden sang this as part of his Folk Song a Day project.

I also hear some points of similarity between "Robinson Crusoe" and "Fine Hunting Day", but they're definitely different tunes, though I wouldn't be surprised if the RC tune belonged to another hunting song.

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