These Regulations amend Schedule 4 to the Investigatory Powers Act 2016 (c. 25). Schedule 4 sets out the public authorities, other than local authorities, who may exercise powers under Part 3 of that Act to obtain communications data (“communications data” is defined in section 261(5) of that Act). It sets out the requirements for authorisations for obtaining communications data, including: the relevant statutory purposes, the types of communications data, the kinds of senior officer capable of providing an authorisation and the circumstances in which they can provide an authorisation.