Code predictions of parameters in the pedestal region of high power H-mode discharges on JET have been performed using the EDGE2D code including (i) self-physically and chemically sputtered carbon impurities, (ii) guiding centre drifts with realistic core boundary conditions, and (iii) an imposed Edge Transport Barrier (ETB). Simulations indicate that these three items have important synergistic effects on the achievable pedestal and SOL parameters. Good agreement with experimental measurements on JET is achieved for a moderate ETB strength of D^ = 0.4 m2.s-1. Preliminary results for ITER are discussed.