The fall in the value of sterling and the recession have helped drive up visitor numbers, but Butlins claims that the improvement in facilities and entertainment, such as Splash Waterworld, have also played their partPhotograph: Martin GodwinThe slogan for the parks established in 1936 was: 'Our True Intent Is All For Your Delight'. The story goes that Billy Butlin lifted it from the front of a fairground organ and only realised years later that it was a quotation from A Midsummer Night's DreamPhotograph: Martin GodwinTeenagers play the Gold Rush Derby game - end-of-the-pier fun is still a mainstay of the Butlins formula Photograph: Martin GodwinIn 1998, as part of a £75 million redevelopment scheme, the Skyline Pavilion was installed at the resort in Bognor Regis to provide year-round, weather- protected restaurants and entertainment areasPhotograph: Martin GodwinThe amusements are the traditional seaside fare of fruit machines and arcade gamesPhotograph: Martin GodwinChalets were the inspiration for Billy Butlin's original holiday camp. He saw the need for accommodation where holidaymakers weren't turfed out in the morning as they were at guesthouses. But hotels will now replace the chalets with five being built at BognorPhotograph: Martin GodwinThe funfair at Butlins holiday campPhotograph: Martin GodwinPeople dancing to a Madness tribute band at an evening show. There's also nightly karoake sessions at the campPhotograph: Martin Godwin'All of a sudden it's chic to holiday in the UK. In the next 18 months or two years, I think we'll get a lot of customers who may not have considered us previously,' says Bognor resort director Jeremy PardeyPhotograph: Martin Godwin