Essery, R, Pollet, S, Smith, K A, Mowbray, F, Slodkowska-Barabasz, J, Denison-Day, J, Hayter, V, Bradbury, K, Grey, E, Western, M J, Milton, A, Hunter, C, Ferrey, A E, Müller, A M, Stuart, B, Mutrie, N, Griffin, S, Kendrick, T, Brooker, H, Gudgin, B, Phillips, R, Stokes, T, Niven, J, Little, P & Yardley, L 2021, ' Planning and optimising a digital intervention to protect older adults’ cognitive health ', Pilot and Feasibility Studies, vol. 7, no. 1, 158 . https://doi.org/10.1186/s40814-021-00884-2 Essery, R, Pollet, S, Smith, K A, Mowbray, F, Slodkowska-Barabasz, J, Denison-Day, J, Hayter, V, Bradbury, K, Grey, E, Western, M J, Milton, A, Hunter, C, Ferrey, A, Muller, A M, Stuart, B, Mutrie, N, Griffin, S, Kendrick, T, Brooker, H, Gudgin, B, Philips, R, Stokes, T, Niven, J, Little, P & Yardley, L 2021, ' Planning and optimising a digital intervention to protect older adults' cognitive health ', Pilot and Feasibility Studies, vol. 7, 158 (2021) . https://doi.org/10.1186/s40814-021-00884-2 Essery, R, Pollet, S, Smith, K A, Mowbray, F, Slodkowska-Barabasz, J, Denison-Day, J, Hayter, V, Bradbury, K, Grey, E, Western, M, Milton, A, Hunter, C, Ferrey, A, Muller, A M, Stuart, B, Mutrie, N, Griffin, S, Kendrick, T, Brooker, H, Gudgin, B, Philips, R, Stokes, T, Niven, J, Little, P & Yardley, L 2021, ' Planning and optimising a digital intervention to protect older adults' cognitive health ', Pilot and Feasibility Studies . https://doi.org/10.1186/s40814-021-00884-2 Pilot and Feasibility Studies, Vol 7, Iss 1, Pp 1-16 (2021) Pilot and Feasibility Studies