The law relating to all three types of leave is currently set out in the 1996 Act and associated secondary legislation.iEmployment Rights Act 1996, Part VIII; The Paternity and Adoption Leave Regulations 2002 (SI 2002/2788), Part 2, as amended, most recently by the The Paternity Leave (Amendment) Regulations 2024 (SI 2024/32); Maternity and Parental Leave etc.