http://lovebox.net/content/terms-amp-conditions.html
if you scroll down for age restrictions,
'•For Friday and/or Saturday only - Children under 12 are allowed in free to the Event. However, proof of identity and age must be provided on request at the admissions gate. The Promoter reserves the right to refuse admission if its staff or agents are in any doubt whatsoever as to the age of the person being presented as being Under 12. A maximum of 4 under 12's per adult will be allowed entry and all Children under 16 must be accompanied by an adult
Please note that if you wish to purchase any combination of tickets that would involve attending Sunday then you must be over 18 years of age to attend on all of the days'