Holtspur Bottom occupies the south-facing hillside at the end of the Holtspur Valley, opposite the Holtspur Bank Local Nature Reserve. It covers an area of about 4.5 hectares (11 acres), is owned by Beaconsfield Town Council, and is managed by the Upper Thames Branch of Butterfly Conservation. It is mostly chalk grassland, with smaller areas of rough grassland and hedgerows. Each of these habitats is managed to make them attractive to different moths and butterflies. It is one of the few reserves in Britain managed specially for these species.