A Lower Palaeolithic industry at Beeches Pit, West Stow, Suffolk, occurs within an interglacial sequence that immediately overlies glacial deposits, referable to the Anglian Lowestoft Formation. There is strong biostratigraphical evidence from both vertebrates and molluscs that the interglacial represented is the Hoxnian (MIS 11). This conclusion is supported by uranium series dates from carbonate nodules (>400 kyr), TL dates from burnt flint (414 AE 30 kyr) and a range of amino acid racemisation data. The archaeology consists of flint artefacts of Acheulian character, including many refitting examples. Charred material is abundant in three stratigraphical units and many bones and flints have been burnt, indicating repeated occurrence of fire. Several discrete areas of burnt sediment appear to be hearths. This interpretation is supported by: (1) the intensity of burning (600-8008C) implied by the charred and calcined bones; (2) the intersection of two of the burnt areas, implying separate burning events at slightly different, overlapping locations; (3) the discovery of two burnt flakes that refit onto an adjacent group that are unburnt, indicating that the burning was highly localised; and (4) the spatial distribution of artefacts respects the features interpreted as hearths, suggesting fireside knapping. Fossils associated with the archaeology indicate occupation within closed deciduous forest in a fully temperate climate. Attractions to this unusual environment would have included the fresh water provided by springs, a rich supply of potential food and a prolific source of good quality flint for tool manufacture. The archaeological evidence therefore suggests that the site repeatedly served as an area of focused activities (perhaps a 'home-base') during much of the interglacial. The upper levels of the sequence provide clear faunal evidence of climatic deterioration during which human occupation and fire use persisted. Biostratigraphical correlations with other Lower Palaeolithic sites lend support to the suggestion that Acheulian and Clactonian industries occurred in Britain during the same substage of the Hoxnian, although not necessarily at precisely the same time.