"Behind mandatory restricted access on adult entertainment channels" is interpreted with reference to rule 1.18 of the Ofcom Broadcasting Code.
"R-18 material" is classified as such by the British Board of Film Classification (BBFC): the BBFC's definition of the R-18 category appears on its website (www.bbfc.co.uk). The BBFC is responsible for classifying "video works", which are defined by, and subject to restriction under, the Video Recordings Act 1984.
Radio Central Copy Clearance – Advertisements for products coming within the recognised character of pornography may be broadcast only if they are centrally cleared.
Radio advertisements for R18-rated material are not permitted.
Television only – Advertisements for products coming within the recognised character of pornography are permitted behind mandatory restricted access on adult entertainment channels only.
Television only – Advertisements must not feature R18-rated material or its equivalent. That does not preclude advertisements for R18-rated material or its equivalent behind mandatory restricted access on adult entertainment channels.
Television only – Advertisements permitted under rules 30.3 and 30.3.1 must not feature material that comes within the recognised character of pornography before 10.00pm or after 5.30am.