Boris Johnson is reported as saying that one of his first actions as Mayor of London will be to order the banning of alcohol on the Tube.
There is already a Byelaw which could be used to ban Alcohol on the Tube:
London Regional Transport Railways Byelaws
Made under section 67 of the Transport Act 1962 as amended by section 37 of the Transport Act 1981 and paragraph 2 of Schedule 4 to London Regional Transport Act 1984 by London Regional Transport and confirmed by the Secretary of State for Environment, Transport and the Regions on 19 December 2000 for regulating the use and working of, and travel on their railways and railway premises and the conduct of all persons while on those premises ("The Byelaws").
.4 Intoxication and possession of intoxicating liquor
1. No person in a state of intoxication shall enter or remain on the railway.
2. Where reasonable notice is, or has been given prohibiting intoxicating liquor on any train service, no person shall have any intoxicating liquor with him on it, or attempt to enter such train with intoxicating liquor with him.
3. Where an authorised person reasonably believes that any person is in a state of intoxication or has with him intoxicating liquor contrary to this Byelaw, the authorised person may:
(i) require him to leave the railway; and
(ii) prevent him entering or remaining on the railway until the authorised person is satisfied that he has no intoxicating liquor with him.
1. Offence and level of fines
Any person who breaches any of these Byelaws, except Byelaw 17, commits an offence and shall be liable for each such offence to a penalty not exceeding level 3 on the standard scale.
"intoxication" means being under the influence of intoxicating liquor, drugs or other substances;
"intoxicating liquor" has the meaning ascribed to it in the Licensing Act 1964 (as amended or replaced from time to time);
A Level 3 Fine is currently up to £1000
Both the Metropolitan Police Service, City of London Police , British Transport Police, and , as of January 2008, Police Community Support Officers are allowed to enforce Byelaws.