To print this article, all you need is to be registered or login on Mondaq.com. Summary The UK's long-awaited National Security and Investment Act passed into law on 29 April 2021 when it received Royal Assent. Secondary legislation will follow and the regime is expected to be fully in force towards the end of the year. Here is what you need to know. The National Security and Investment Act 2021: The UK's long-awaited National Security and Investment Act passed into law on 29 April 2021 when it received Royal Assent. Secondary legislation will follow and the regime is expected to be fully in force towards the end of the year. Although the Act is not