Who authorises BBC covert surveillance?

Here is the source document it is a big PDF file
Office of Surveillance Commissioners - Inspection Report


"BBC is undertaking a very specific form of covert surveillance."

Here's the authorisation process as I understand it from reading that report:

Because of human rights concerns, the BBC's use of surveillance is subject to the Regulation of Investigatory Powers Act.

Before surveillance is permitted to be executed on an address these steps must be followed:
1. First an applicant must make a written application requesting authorisation for survellance of that specific address, stating the reasons why that address is targeted. 
2. The application is then evaluated by a gatekeeper.
3. The application is then evaluated by one of the two authorising officers.
4. Only then can the surveillance (for example detector van or handheld device) be executed by detection operatives.

Who is the applicant? One of the tv licence enforcement officers (or whatever they are called) i.e. a Capita employee.

Who is the gatekeeper? One specific high-up Capita employee whose name is redacted from the report.

Who are the two authorising officers? Two specific high-up Capita employees named in the report who are granted this power under RIPA regulations.

Who executes the surveillance? Capita employees.

I have recently received several written threats of surveillance, but now I can rest easy, knowing that the written application, to spy on my family, will never get through that strict and independent authorisation process.

Where's the sarcasm smiley when I need it?