This project examined supermarket pricing behaviour in respect of special offers designed to appeal to consumers to encourage them to make additional purchases, which in turn might lead to consumers overeating (and thus exacerbating obesity problems in the United Kingdom population) or wasting uneaten food products (and thus exacerbating household food waste problems in the UK). The data produced result from the analysis of summarised data on different types of pricing offers made by four UK supermarket retailers, covering weekly collected price data from their websites for a one year period running from August 2010 to August 2011, in total covering 1,287,714 pricing observations. The price data covered special offers and the summary aggregate data was based on the research team's own calculations of special offers offered by the supermarkets across a broad group of products. Further information may be found on the ESRC's The Impact of Retail Pricing on Overeating and Food Waste award webpage. The data comprise a single quantitative file, that includes price data collected on special offers from four UK supermarket retailers' websites.