Researchers from outside the European Union represent an increasing proportion of the UK doctoral student body. However, relatively little research exists on their experience from their own perspective. This research, based on interviews with students from a range of countries and scientific and engineering disciplines, seeks to address that deficit. It looks in particular at the difficulties the researchers identified whilst undertaking doctoral study, which included isolation, a lack of integration with home students, cultural adjustment problems and ongoing language difficulties. Two important findings emerged: firstly, that research groups appear to exhibit a "microclimate" which is determined by factors including the style of the supervisor and the norms of social and work-related interaction. Groups with a more cohesive microclimate presented a more supportive environment. Secondly, evidence emerged of a widespread deficit in understanding of cultural issues. This, when combined with language difficulties, aggravated the problems experienced by the overseas students. (Contains 2 tables.)