I think that you need to look at the legislation alongside the culture of the organization. In the U.K. we've done both. So there has been a big culture shift inside governments towards the presumption that data can be published and that where it can be published it should be, partly to help your colleagues in government when they're looking for data but also as a generally good thing to support innovation and greater accountability in the U.K.
The legislation that we've been working on came in under the Protection of Freedoms Act, which amended freedom of information legislation in the U.K. to make changes to how the data could be used and published, enabling reuse and also enabling people to ask for data in technical formats.