and using the handpump rotation method. It claims its festivals are Britain's largest. The number of different beers that can be provided in a pub festival ranges from about 15 to about 100. In all British festivals the beer is sold in quantities of half or full pints. From 2006 the GBBF additionally served beer in "nips" (one-third of a pint), for the benefit of those who wish to sample many beers without consuming excessive amounts of alcohol. Notable British beer festivals Beer festivals are held across the United Kingdom. Notable ones include: The Great British Beer Festival held annually in August in London is the largest beer festival in the UK organised by the Campaign for Real Ale. The "GBBF", founded in 1977, was attended by over 66,000 people in 2006 when 350,000 pints of ale were consumed over the five days. In the past it has been held at various locations but London has been its venue since 1991. The CAMRA Great British Beer Festival Winter; held at various locations, currently Birmingham, is designed to showcase beer styles which may not be readily available during the summer festival. Taking place every February, it has also been celebrated in Glasgow, Burton-on-Trent, Manchester, Derby and Norwich. The Farnham Beer Exhibition in Surrey, having been held every year since 1977 at the Farnham Maltings, is the longest-running beer festival to be held annually on a single site in the United Kingdom, and every year sells over 29,000 pints of real ale during its 3-day opening. The Cambridge Beer Festival, held since 1974, is the longest running beer festival, although it has changed venue three times. Currently, it is held for a week each May in a large marquee erected on Jesus Green in Cambridge. It is the third largest British beer festival behind London and Peterborough. In 2007, it was attended by 30,384 visitors, who drank about 70,000 pints of beer and 194 tubs of cider and perry. The Rotherham Real Ale and Music Festival, held since 1992 is the largest Real Ale Festival in the North of England. In 2011, the festival sold in excess of 85,000 half pints of beer during its four-day opening. The Battersea Beer Festival, is a three-day-long annual festival held at the Battersea Arts Centre, Battersea, London, since 1991. In addition, many small festivals are organised by local CAMRA branches, pubs, clubs and charities. Belgium