Combining models to generate a consensus effective reproduction number R for the COVID-19 epidemic status in England by Manley, H, Park, J, Bevan, L, Sanchez-Marroquin, A, Danelian, G, Bayley, T, Bowman, V, Maishman, T, Finnie, T, Charlett, A, Watkins, NA, Hutchinson, J, Medley, G, Riley, S, Nowcasts Model Contributing Group, Panovska-Griffiths, J