Technically, there is no law against being nude in public in the United Kingdom. Simple nudity is not illegal. Even performing what someone might consider to be an obscene act in a public place may not be against the law. In practice, this means that if you are nude, minding your own business and practicing good nude beach etiquette on a beach that is unofficial but, by common consent, considered to be a nude beach, you are unlikely to have any problem at all.