Police have warned people they could be arrested for sunbathing naked in their own gardens. Public nudity is not an offence, and in your garden you could have an expectation of privacy, but if police being you have stripped off with the intention of causing harassment, alarm or distress then you could be in trouble.
It would then be an offence under Section 66 of the Sexual Offences Act 2003, reports The Mirror. The Crown Prosecution Service says: "In the case of naturism a balance needs to be struck between the naturist's right to freedom of expression and the right of the wider public to be protected from harassment, alarm and distress."
The advice from the police is to let neighbours know what you're up to before you head out into the sunshine with no clothes on, as well as trying to set up camp in an area of your garden that is screened from view.