Two issues are particularly important in extrapolating divertor conditions to future machines: perpendicular anomalous transport and the upstream separatrix density. In order to improve our understanding of these two issues, we attempted to use the same modelling tools and very similar experimental methodology on ASDEX Upgrade (AUG) and JET plasmas. It is important to use the same approach for both experiments, otherwise dierences in the methods could cause an incorrect size scaling when the results are combined. On AUG the use of upstream edge (pedestal and SOL) measurements of temperature and density have proved particularly effective in deriving edge transport coefficients by the use of an automatic fit procedure. This work describes the attempt to apply this technique to JET.