Ethnic minority entrepreneurship in Britain is no longer mainly associated with established ethnic minority groups, notably, South Asian and Afro-Caribbean, but rather immigrant entrepreneurs are increasingly evident from the world over. This phenomenon, which is a product of the increasingly complex socio-economic geography that is emerging in many British cities as a result of globalisation, mass migration and the so-called ‘diversification of diversity’, is particularly evident in the global ‘ethnic supermarket’ that is contemporary London. Yet, the phenomenon constitutes something of a challenge for mainstream business support organisations. The paper will therefore seek to address this challenge by exploring (a) the current understanding of the nature of entrepreneurship among new and emerging ethnic minority business communities; and (b) the relationship between such enterprise activity and the UK institutional business framework. The aim is to provide a basis for the development of policy strategies that can effectively engage with these groups, particularly with respect to the current interest in the possibilities for enabling transition from informal into formal enterprise activity.