In current large tokamaks non-intrinsic seeded impurities have been used to produce divertor power loads which would be considered acceptable when extrapolated to ITER. Many devices have achieved the goal of high fractional radiated powers, small frequent ELMs and detachment which are characteristic of radiative H-mode regimes. However, it has been a matter of concern that the Zeff associated with the seeded impurities may exceed that allowable in ITER and also that the degradation in energy confinement may be unacceptable. Confidence can only be built in the prediction of these parameters in ITER if reliable scalings are available for impurity content and energy confinement which have a sound physics basis. This paper describes work at JET in this area whilst using multi-machine data to characterise the size scaling and provide a context for the JET data. Predicted levels for the impurity content of seeded ITER plasmas appear to be of marginal acceptability. The situation with regard to confinement is less clear. Dimensionless parameter scaling experiments have been conducted in which β, q95, fractional radiated power and Zeff are held constant for a range of ρ*. The scaling of global energy confinement derived from these radiative discharges appears to be Bohm-like. However, local transport analysis of JET pulses using the TRANSP code suggests that the effective thermal diffusivity of the core retains its gyro-Bohm like scaling.