In southwest England, Trading Standards officials carried out a survey of various pubs and other alcohol-serving venues and discovered that one in five pints had noticeably less liquid than it should. Given that this shortabe happend with such regularity at many different locations, perhaps the theory is that once you've had a few pints, you won't really be worried about a few extra mouthfuls. Or, perhaps the quality of bartenders has simple declined, since it is much more difficult to pull a drink with the appropriate amount of foam than you might guess.
Officials recommend asking for a top-off if the drink appears to be a bit short, not only to ensure that you're getting what you've paying for, but to encourage vendors to be a bit more careful in their pouring in the future.
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