The document discusses the commercial value of open data and lessons learned from legislation.gov.uk, an open data website of UK legislation from 1267 to present. It notes that bodies who publish public data should think of how to provide it as open data. There are often intermediaries who take raw open data and add value through links, snippets, searches or updates for consumers. Successful open data relies on partnerships between publishers and intermediaries to ensure data quality and that all parties benefit.