GHB, GBL and 1,4-BD are all Class C drugs under the Misuse of Drugs Act 1971. It is against the law to possess them or to sell them for human ingestion.
GHB was brought under the Misuse of Drugs Act as a Class C drug in 2003. Over time, it became apparent that dealers and users were switching to GBL and 1,4-BD as legal alternatives to GHB, so in 2009, GBL and 1,4-BD were also brought under the control of the Misuse of Drugs Act.
GBL and 1,4-BD both have legitimate industrial uses and are still available for these purposes to people with appropriate business registration. However, if someone sells or supplies them, either knowing or suspecting that they will be swallowed and ingested, then they are committing an offence.
Penalties for possession are up to 2 years in prison and/or an unlimited fine. Supply holds penalties of up to 14 years in prison and/or an unlimited fine.