I would go back to what Chief Superintendent Burchill said in terms of investigations. This information, in probably close to the majority of situations, is given voluntarily currently. The confirmation of service demand is a stopgap for service providers that require the piece of paper so they have something to respond to in order to protect them from liability.
In terms of the deleterious effects, this is already being done. This is part of routine police work. As I think Sergeant Gilkes said, it's a requirement to know who the service provider is before you go to court to get a production order against that service provider.