All persons aged under 16 must be accompanied and sat next to the accompanying adult when seeing the MAMMA MIA! musical. They may not sit on their own within the auditorium. If children do have separate seats, entry could be refused to MAMMA MIA! West End. All patrons, regardless of age, must present a valid MAMMA MIA! ticket to gain entry to the theatre. Please ensure that any children or infants for whom you are responsible also have a valid MAMMA MIA! West End ticket. Your child should be able to sit unaided within the purchased seat. We do not allow children to be seated on an adult’s lap or babes in arms.