Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, regarding Part P of the Building Regulations and in caravan and camping parks, is answered by the ECA:

Answer: The only installation that would come under the scope of Part P is if there is a self-contained dwelling on the site. An example might be a dwelling for the site manager or similar.
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www.voltimum.co.uk/consult.php?universe=consult.index.questions