Rewire/refurbishment of fire damaged property

New project/job just started a full refurbishment of a property in Gloucester Road following extensive fire damage..
Works are being carried out for the client, who in this case is an intermediary company working for the property owners insurance company.
As you can imagine the works involve a full rewire as the existing electrical system had been damaged by the fire and then had several thousand gallons of water applied to it..
Why do you feel a rewire is necessary asked the insurance surveyor..doh