The Supreme Court considered issues surrounding 'linguistic analysis reports' provided by a commercial organisation (Sprakab) in asylum appeals. It examined the appropriateness of guidance given in RB (Linguistic evidence – Sprakab) ([2010] UKUT 329 (IAC)) (RB), particularly with respect to the anonymity of Sprakab's individual analysts and linguists. With regard to the particular respondents, the reports' comments on their knowledge of country and culture had been inadequately supported by the authors' expertise. Further, the Upper Tribunal (Immigration and Asylum Chamber) had treated RB as binding and had failed to give critical analysis to the particular reports relied on.