Improving the representativeness of UK’s national COVID-19 Infection Survey through spatio-temporal regression and post-stratification by Pouwels, K, Eyre, D, House, T, Aspey, B, Matthews, PC, Stoesser, N, Newton, JN, Diamond, I, Studley, R, Taylor, NGH, Bell, JI, Farrar, J, Kolenchery, J, Marsden, B, Hoosdally, S, Jones, Y, Stuart, D, Crook, D, Peto, T, Walker, AS, COVID−19 Infection Survey Team