H-mode plasmas on JET. A wide parameter space was covered to find the best match to control experiments from recent nitrogen seeded plasmas. From this match, a deuterium scan was performed and predicted well the experimentally observed changes in the outer target plasma for the same deuterium scan. Due to an underestimate of the inner target's degree of detachment, however, a simultaneous match to the inner target bolometric and spectroscopic data could not be achieved. Nitrogen was seeded into the best match deuterium/carbon case, and preliminary findings are discussed and compared to experiment.