Chapter 2 investigates the extent of the use of Bank notes in British society during the Bank Restriction period. Drawing upon the Bank of England’s Lost Note Books – the record of claims submitted by customers who had lost their Bank notes – this chapter traces the geographical and social distribution of Bank note users. Following in the footsteps of John Clapham, who explored what he called the ‘radius of the Bank of England note’, this chapter reveals the patterns of the Bank note’s diffusion into British society and the underlying causes of its penetration into a number of places on the British Isles. The three factors that significantly affected the pattern of diffusion were commerce, the culture of sociability and Britain’s ongoing wars with France. These economic and extra-economic factors determined where the Bank notes were likely to see relatively extensive use. This chapter’s argument is underpinned by a large data set compiled from the Lost Note Books, which contain information about Bank note users’ identity as well as their geographical and social distribution. This unique source provides valuable insights into the diffusion of Bank note use.