This debate about access to data about railway delays in Britain has interesting implications in other fields such as electricity. She told me part of the problem is when public services are provided by the private sector; such firms claim that selling data is a revenue stream for them, and ask for public-funded subsidies to make it open. For example, the state-owned Ordnance Survey mapping company has made much of its data open, but takes a £10 million annual subsidy to do so, according to The Independent. “It’s particularly frustrating when organisations aren’t making much money from it,” Tennison added, noting that the costs of selling data—including lawyers for licensing and enforcing terms—often outstrip any revenue. Tennison hopes that’s not the case.