ELMy H-modes are currently the favoured plasma operating regime with a proven capability for steady state performance. The confinement of these plasmas in standard conditions (mainly Neutral Beam heating NB, density far from the Greenwald limit [1], moderate edge shear, type I ELMs) has been studied, and the results used within the Multi-Machine Confinement database from which the latest confinement scaling law (H97) has been derived [2]. The projection of the performance of ELMy H-modes to ITER show that the plasma density required to achieve high Q or ignition is near or above the Greenwald density nGR. Moreover, Type I ELMy regimes may not be suitable for a reactor, unless the peak power load on plasma facing components is reduced [3]. This paper reports on experiments carried out in the JET MkIIA campaign with high density ELMy H-modes. In particular, we focus on the edge pedestal characterisation and on the study of the transition from type I to type III ELMs at high density. The effects of the plasma edge magnetic shear on density, confinement and ELM power losses are also discussed.