Covert Human Intelligence Sources (Criminal Conduct) Bill

I am grateful to my right hon. Friend, who is being generous. At what level will the original authorisation take place in the various organisations? From reading the Bill, it seems to me that the level in the police is a relatively junior police officer. In view of the seriousness that such authorisation leads to, should it not be given at chief constable level, and why can it not be given through a warrant overseen by a judge?