Using data from the UK Labour Force Survey, the article describes the major trends in freelance workforce numbers during the past 20 years. Operationalising a definition of freelancing in terms of Labour Force Survey categories, the data indicates both a substantial absolute increase in freelancer numbers and growth as a proportion of all workforce jobs. Possible explanations for the increase are discussed, paying particular attention to the demand for freelancers. Although a number of studies suggest a shift towards the adoption of flexible labour strategies, the evidence base on the forces underlying the expansion of freelance working is limited and fragmented. Research questions seeking to explore the trends in greater detail are identified.