A new analysis technique has been developed for the study of the decay rate of sawteeth perturbed Te profiles to investigate electron transport in the spatial zone between the inversion and mixing radii. The data presented are from JET Land H mode plasmas with currents ranging from l.5MA to 6MA and with additional heating ranging from 2 to 22MW. Low values of the dynamic electron heat diffusivity ceHP were obtained for very good confinement H modes (VH modes) with high values of Te and Te. No simple dependence of electron conductivity on Te or Te can produce the ceHP values obtained in all regimes L, H and VH. However we have found in general that the variations of ceHP due to parameter changes were consistent with those observed for the heat diffusivity obtained from power balance calculations.