Jon attributes his source as “From Silly Sisters,” also confessing that it’s “Sung with great enthusiasm around staff camp fires on Forest School Camps.”
That Silly Sisters album again, which I can happily say I now own, having found a very nice vinyl copy in Bristol for a reasonable price. I haven’t had the chance to play it yet, hardly having been at home since, but I took your collective recommendation and look forward to getting to grips with it this coming weekend with a bit of luck. I guess the song needs no explanation and Martin Carthy, Bert Lloyd and Lou Killen have all had a crack at this as well as Maddy and June and you can catch up with several of those at Mainly Norfolk. You can also start a dabble at Mudcat over here. I note that the link claiming a version dated 1638 is sadly broken although there seems to be an C18th version available in the Bodleian.