How do we scale up the oversight of algorithmic systems? The mass-marketisation of generative technologies is increasing the rate at which people are exposed to their risks, while our analytic capability to assess algorithmic systems is shrinking in the political economy that is created: production platforms are too far removed from the context of use, SaaS business models are disintermediating the organisations that implement them, and regulatory authorities cannot keep up with the scale of use. In this panel we will discuss practical experiences of parties who have tackled this epistemological problem. Michael Veale will articulate the emerging challenges, the Dutch DPA will present the results of a first-of-its-kind national algorithm audit, the Dutch Ministry of the Interior will discuss the knowledge community around their public Algorithm Register, and Algorithm Watch will share their experiences with cross-border collaborative research networks.