SI 2023/1099. The Misuse of Drugs (England and Wales and Scotland) (Amendment) Regulations 2023. Comes into force 8th November. Amends the Misuse of Drugs Regulations 2001 (SI 2001/3998) to place nitrous oxide, and preparations or products containing nitrous oxide, in Schedule 5 and to make provision for lawful access to the substance for legitimate purposes, including medical use.