This survey forms part of a project investigating the emergence of Pre-Exposure Prophylaxis (PrEP) within the UK (see our study website). We are working with a group of charities, non-profit organizations and consumers to understand how the market for PrEP has emerged within the UK and explore how PrEP may change people's habits and lifestyles. This research intends to inform development of the roll-out of PrEP within the UK and beyond, and to inform health charities about non-NHS drug market activism. The research is being conducted in London, Manchester and Leeds, and is kindly supported by grants from the Academy of Marketing and Goldsmiths, University of London. Many thanks for taking part!