The pedestal structure of type I ELMy H-modes has been analysed for JET-ILW. The electron pressure pedestal width is independent of ρ* and increases proportionally to √β pol,PED. Additional broadening of the width is observed, at constant β pol,PED , with increasing ν* and/or neutral gas injection and the contribution of atomic physics effects in setting the pedestal width cannot as yet be ruled out. Neutral penetration alone does not determine the shape of the edge density profile in JET-ILW. The ratio of electron density to electron temperature scale lengths in the edge transport barrier region, η e , is of order 1.5-2. The inter-ELM temporal evolution of the pedestal structure in JET-ILW is not unique, but depends on discharge conditions, such as heating power and gas injection levels. The strong reduction in p e,PED with increasing D 2 gas injection at high power is primarily due to clamping of ∇T e, half way through the ELM cycle and is suggestive of turbulence limiting the T e pedestal growth. The inter-ELM pedestal evolution in JET-ILW is consistent with the EPED model assumptions only at low beta. At higher beta the inter-ELM pedestal evolution is qualitatively inconsistent with the KBM constraint at low gas rate, while at high gas rate the P-B constraint is not satisfied and the ELM trigger mechanism remains as yet unexplained.