The new millennium, now almost 20 years old, has been characterised by a recognition within the research community of the importance of the free flow of research data; not simply in the ability to access the data, but also in the understanding that this valuable resource needs to be reused and built upon. We believe there have been at least two main drivers for this. First, those who pay for the research want to know it is leading to useful outcomes with impact–the transparency and accountability agenda. Second is an appreciation that the major global concerns (food, health, climate, economy) are extraordinarily complex (‘wicked’) problems, [