The Police Have Powers Under Section 46 Of The Children Act 1989 To Protect Children.
If the police believe a child is at risk of suffering significant harm in a situation then they can exercise powers to remove the child to suitable accommodation.
However the child cannot be kept in police protection for more than 72 hours.
The usual procedure would be for the child to then be turned over to the local authority to be placed into foster care.
It is at this point that a new name would be given so the child can start a new life in a new location with a family.
A court can make an order protecting the child’s identity.