"Outraging public decency (OPD)
At common law it is an offence to do in public any act of a lewd, obscene or disgusting nature which outrages public decency. Although this may be widely interpreted, most cases will involve indecent exposure of the human body. If conduct falls within the scope of a statutory offence, such as exposure contrary to section 66 of the Sexual Offences Act 2003 (see above) it is better practice to charge that offence unless, exceptionally, the offence merits a higher penalty than that available in relation to the statutory offence. OPD is triable either way and there is no maximum penalty.
The requirement for the behaviour to 'outrage' public decency was said by Lord Simon in Knuller (Publishing, Printing and promotions) Ltd v DPP to: "go considerably beyond the susceptibilities of, or even shocking, reasonable people". The circumstances surrounding the conduct will need to be carefully considered.
A naturist whose intention is limited to going about his or her lawful business naked will not be guilty of this offence."