A prototype infrared video bolometer (IRVB) was succesfully deployed in MAST-U, the first deployment of such a diagnostic in spherical tokamaks. The IRVB was designed to study the radiation around the x-point and has the potential to return emissivity profiles of unprecedented spatial resolution. The system was fully characterised prior installation on MAST-U and the results are here summarized. After installation it was verified that the actual geometry matches the design, a particularly difficult process for bolometers, using specific features of the plasma itself. The measurements are consistent with observations from other diagnostics magnetic reconstructions, Langmuir probes, visible light cameras and resistive bolometry. Early results show that with a conventional divertor geometry and only intrinsic impurities the progression of radiative detachment follows a similar path to large aspect ratio tokamaks. The peak of the radiation moves along the separatrix from the legs to the inner midplane up to form a MARFE-like structure that can eventually penetrate the core.