These Regulations amend Schedule 4 to the Investigatory Powers Act 2016 (c. 25). Schedule 4 (relevant public authorities and designated senior officers etc.) sets out the public authorities, other than local authorities, who may exercise powers under Part 3 of that Act to obtain communications data, the statutory purposes for which the communications data may be obtained, the type of communications data which may be obtained and any designated senior officers within those authorities who may authorise the obtaining of communications data internally, including in urgent cases.