Generally, you can drink as a passenger on private property. Motorhomes and hired vehicles, like a taxi, are exempt from the law, so long as you are in the living areas or the backseat. But you must still be at least 21 years of age to drink alcohol.

While there is no specific law in the UK that forbids a passenger from drinking alcohol inside a licensed London Black Cab, it is generally at the driver's discretion. Most drivers will politely discourage it because of the "Soiling Charge"—if you spill your drink or become ill, the driver is legally allowed to charge you an extra £40 to £60 (the current rate for 2026) to cover professional cleaning and the loss of income while the cab is out of service. Additionally, if the cab is passing through a "Public Space Protection Order" (PSPO) zone where street drinking is banned, or if you are behaving in an anti-social manner, police can intervene. For most "standard" rides, as long as you are respectful and using a closed container, many drivers won't mind, but they are within their rights to refuse the journey if they feel you are too intoxicated. It is worth noting that drinking is strictly banned on all TfL services like the Tube, buses, and trams, so the Black Cab is the only real "exception" in London transit.