  The former all-carbon wall on JET has been replaced with beryllium in the
main torus and tungsten in the divertor to mimic the surface materials
envisaged for ITER. Comparisons are presented between Type I H-mode
characteristics in each design by examining respective scans over deuterium
fuelling and impurity seeding, required to ameliorate exhaust loads both in JET
at full capability and in ITER.
