By Justin Rowlatt and Esme Stallard, BBC News Climate and Science
The Supreme Court has ruled that Surrey County Council should have considered the climate impacts of burning oil drilled from new wells in Horley.
Under planning law the assumption has always been that only the impacts from constructing the wells and not the use of the final oil products should be considered.
The case brought by Sarah Finch, on behalf of campaigners, could threaten new UK fossil fuels projects.
The council said it followed planning law.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version.
You can receive Breaking News on a smartphone or tablet via the BBC News App. You can also follow @BBCBreaking on Twitter to get the latest alerts.