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Porton Down

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As well as being a Site of Special Scientific Interest (SSSI), Porton Down is also a Special Area of Conservation (SAC) and a Special Protection Area (SPA) covering over 1500 hectares. It constitutes the largest uninterrupted tract of semi-natural chalk grassland in Britain, a habitat which has declined by more than 80% in the last 50 years. As well as the grassland the site supports large areas of mixed scrub, including juniper, and broadleaved, mixed and coniferous woodland.