First observation of Cherenkov ring images using hybrid photon detectors by Albrecht, E, Barber, G, Bibby, J, Brook, N, Duane, A, French, M, Gibson, V, Giles, R, Halley, A, Harnew, N, John, M, Miller, D, O'Shea, V, Schomaker, R, Smale, N, Websdale, D, Wilkinson, G, Wotton, SA