The UK has long experienced a shortage of social workers and has recruited internationally to meet demand. There have been few specific data quantifying the scale of social work mobility to the UK through which such experiences can be set in context. The analysis reported in this article uses data from October 2008, relating to registered social workers working in England. As part of a wider study of migrant social care workers in England, the article reports analysis of data records of over 7,000 non-UK social workers registered to work in England and compares their characteristics to UK-qualified social workers. These analyses are supplemented by analysis of more recent application and registration data from the General Social Care Council pertaining to social workers qualified within and outside the European Union during 2008 and 2009. The findings highlight several important observations in terms of non-UK-qualified social workers' profile as well as some possible trends in migration and variations in rates of qualification verification. Over half of all international social workers in England were trained in four countries: Australia, South Africa, India and the USA. Findings are contextualised with qualitative data obtained from the wider study and policy debates.</p