It is good practice to ensure that regular inspections are carried out without prior notice, at places of entertainment. Inspections are normally undertaken by LEA staff. The officer would make his or herself known to the chaperone on arrival and will have proper identity cards.
Chaperones should under no circumstances hand any child over to, or let the child be examined by, any other person. The only exceptions to this are with the prior approval of the child's parent, or in emergencies, and then under the supervision of a doctor, police officer in uniform, or other suitable persons.