Foreign Travel Advice - UK
Circular 001/2022: Reclassification of GHB and related substances
A change to the Misuse of Drugs Act 1971: reclassification of Gamma-Hydroxybutyric Acid, Gamma-Butyrolactone and 1,4-Butanediol from Class C to Class B.
Read the original advice at Foreign Travel Advice (UK)