Whilst The Weights and Measures Act 1985 controls the measurements that draught beer is sold in, there are ambiguities over how much head it should have.

Industry body The British Beer & Pub Association says a pint should contain a minimum of 95% liquid and 5% head.

City of London Trading Standards officers are ensuring that drinkers are getting their money’s worth. They are thus recommending that a pint means a pint of liquid. This means that customers are completely within their rights to request a top-up if they so require. They also want pub-goers to alert them if they are denied a top-up or receive negative feedback.

To facilitate this, they are giving out special beer mats, helping consumers check if a pint is short. Drinkers can hold the mat against their glass to see whether they have been served a full pint.

Steve Playle, Trading Standards Manager at the City of London Corporation, says:

“It’s worth remembering that for a pint costing five pounds, a shortage of five percent is a 25p cost to the consumer. Drinkers are entirely within their rights to ask for a full pint of liquid if they wish.

“We are reminding people that it is perfectly okay to ask for a top-up whilst stressing that they should continue to drink responsibly.”

The Corporation has written to all pubs within the square mile, reminding them of their legal obligations. They are also encouraging them to refer customers with drinking problems to alcohol support services.

However, though this is beneficial to paying customers, beers such as Guinness and Peroni are traditionally poured with some head. By enforcing this rule, some feel this may affect the taste of certain drinks.

Additionally, some believe that rather than promoting drinking, the Corporation should be tackling problems such as alcohol abuse and underage drinking.