First results of gyrokinetic analysis of JET ELMyH mode plasmas are presented.ELMy H mode plasmas form the basis of conservative performance predictions for tokamak reactors of the size of ITER.Relatively high performance for long durations has been achieved and thescaling appears to be favourable.It will be necessary to sustain low Zeff and highdensity for high fusion yield.The article studies the degradation in confinement and the increase inthe anomalous heat transport observed in two JET plasmas: one with an intense gas puff and the other with a spontaneous transition from type I to III ELMs at the heating power threshold.Linear gyrokinetic analysis gives the growth rate γlinof the fastest growing modes.The flow shearing rate γE×B and γlin are large near the top of the pedestal. Their ratio decreases approximately at the time whenthe confinement degrades and the transport increases. This suggests that tokamak reactors may require intense toroidal or poloidal torque input to maintain sufficiently highγE×B/γlin near the top of the pedestal for high confinement.