Performance of 8-and 12-dynode stage multianode photo-multipliers by Bibby, J, Buckley, A, Chamonal, R, Easo, S, Eisenhardt, S, Gibson, V, Harnew, N, Muheim, F, Howard, A, Lawerence, J, Pickford, A, Plackett, R, Price, DR, Rademacker, J, Smale, N, Soler, F, Somerville, L, Storey, J, Websdale, D, Wotton, S