The Telegraph reports that Thaler recommends that groups of friends out drinking should instead 'run a tab' that would result in each individual paying only for the drinks they had themselves consumed. Clearly this would only work with certain groups and in certain establishments. Lloyd George was more proscriptive. Drinks had to be paid for when ordered - no credit. And buying a drink for another person - 'treating' - was also illegal and punishable by up to six months imprisonment with hard labour. It applied to prohibit even men buying a drink for their wives; each had to order and pay separately. The 'long pull', the over-provision of a regulated quantity of beer or ale, the 1915 equivalent of two-shots-for-one, was similarly banned. The wording of the Orders was comprehensive;
No person shall either by himself or by any servant or agent sell or supply any intoxicating liquor to any person in any licensed premises or in any club for consumption on the premises unless the same is ordered or paid for by the person so supplied; nor shall any person order or pay for or lend or advance any money to pay for any intoxicating liquor wherewith any other person has been or is to be supplied for consumption on the premises; nor shall any person consume in any licensed premises or club any intoxicating liquor which any other person has ordered or paid for or lent or advanced money to pay for.
Did it work? Yes, in a way. It helped to prevent lighter drinkers in a group from being trapped in a 'race' with beer gluttons, and it's always the gluttonous drinker in a group who benefits from rounds. However it didn't help at all the person whom Cameron would like to target - the gluttonous drinker. It stayed on the books until the 1960s - or at least the 'No Treating' notices survived until then. Widely breached by men entertaining women, whether their wives or not, it fell into desuetude and like the law about bicycle bells was forgotten even by policemen.