UK research needs in grid scale energy storage technologies by Brandon, N, Edge, J, Aunedi, M, Bruce, P, Chakrabarti, B, Esterle, T, Somerville, J, Ding, Y, Fu, C, Grant, P, Hall, P, Huang, C, Leng, G, Li, Y, Martins, V, Navarro, M, Gil Posada, J, Rennie, A, Rogers, D, Strbac, G, Perez Villar, S, Yufit, V, Wang, J, Worsley, D