Not the OP, but it's likely referring to the Investigatory Powers Act which has a table summarising what officers of which government agencies can authorise and delegate access to what data:

https://www.legislation.gov.uk/ukpga/2016/25/schedule/4/enac...

Where a "grade 6" staffer of the Food Standards Agency "(b) may authorise the obtaining or disclosure of data by a person who is not an authorised officer, or any other conduct by such a person, which enables or facilitates the obtaining of the communications data concerned, and (c) may, in particular, require a telecommunications operator who controls or provides a telecommunication system to obtain or disclose data relating to the use of a telecommunications service provided by another telecommunications operator in relation to that system."