Effectiveness of Multimodal imaging for the Evaluation of Retinal oedema And new vesseLs in Diabetic retinopathy (EMERALD) per Lois, N, Cook, J, Aldington, S, Waugh, N, Mistry, H, Sones, W, McAuley, D, Aslam, T, Bailey, C, Chong, V, Ghanchi, F, Scanlon, P, Sivaprasad, S, Steel, D, Styles, C, McNally, C, Rice, R, Prior, L, Azuara-Blanco, A, Emerald Study Group