Sites aimed at children
If a site is aimed at children of 13 or under, and you intend to collect and keep information, they should normally be asked to confirm that a parent's permission has been granted before their details are recorded in any system. For example by the use of a clickable box placed in the "Use of Data" notice.
When sites simply ask for competition entries and do not intend to keep the information after the competition has been won, it will normally only be necessary to prompt a child to ask their parent or guardian for permission first.
For more on parental consent see Section 9: Children - Parental consent.