World War and four times as many since the founding of Camra. Iain Loe, a spokesman for Camra, explained a preference for moderate alcohol levels and a perception that real ale was healthier as responsible for the shift. Since the 2010s, there has been what some media outlets describe as an "explosion" of interest in craft beer. Although, the term "craft beer" does not have formal definition in the UK, it is generally taken to mean beer from small breweries which is highly flavourful and distinctive, particularly "hop forward" beers, delivered in bottles or the keykeg draught formats, ideas mainly deriving from the US microbrewery scene. Craft beer may stand alongside other beers in a mainstream pub, or be retailed in specialist outlets, such as the chain owned by Scottish brewers Brewdog. Craft beers are often stronger than standard ales and lagers, and may be sold in pint and pint measures in addition to the usual pints and halves. A number of commentators have noted that craft beer appeals to a younger clientele, particularly those characterised as hipsters. A number of breweries associated with the craft movement have been taken over by multinationals, prompting debate about whether they should still be considered "craft". Although the choice available to English beer drinkers in the mid-2010s is perhaps unparalleled, there are concerns about the future of pubs, with about 30 closing per week. Bucking the trend somewhat are craft beer outlets, the Wetherspoons chain, and the micropub movement The Wetherspoons chain has expanded to nearly 900 outlets over its 25-year history, most of them being former shops, banks and so on, rather than traditional pub premises. Describing themselves as freehouses, its branches offer a wider range of cask ales than other pubcos, and they have recently begun offering craft beer. Micropubs are small community pubs with limited opening hours, and focusing strongly on local cask ale. With cask ale having a secure future, the Campaign for Real Ale has () been reconsidering its aims, with the options including focusing on the preservation of pubs. English beer styles Bitter Bitter is the broad term applied to a well-hopped pale ale, from about 3.5% to 7% in strength and pale gold to dark mahogany in colour. English brewers have several loose names for variations in beer strength, such as best bitter, special bitter, extra special bitter, and premium bitter. There is no agreed and