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I would imagine they were given permission. The difference with the Long Man case is they are not actually touching the monument.
More links:
http://blogs.guardian.co.uk/news/archives/2007/07/17/cerne_abbas_simpson.html
http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=468796&in_page_id=1770
http://www.thesun.co.uk/article/0,,2-2007320865,00.html
Of course Pagans are seen as fair game and just add to the perceived quirky comedic nature of the story, unlike other religious entities we could name.
Free publicity anyone?
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