 EU Free Movement law is a constantly evolving and changing, which ensures that these regulations need to evolve frequently and this is shown by the significant number of amendments issued by Statutory instruments from the UK Government.Member states are bound by the EC treaties to implement Directives into national law.However, a significant amount of case law (or precedents), often predating the directive, and the historical development (see Freedom of movement for workers) must also be taken into account to correctly interpret EU law.