In a nutshell, they are wooden tents ->

http://www.castlerigg.co.uk/the-park/camping-pods/

(this isn't the site we use, but the pods are the same)

Dick Dastardly used one last year, warm & dry but still close enough to the action.....

We'll get prices etc once we book up the site next year.

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Never underestimate the power of stupid people in large groups.