There a several books which contain English Mummers' plays and discussion/analysis of them (E. K. Chamers (1) and Alan Brody(2)), but the biggest collection I know if is that of R. J. E. Tiddy (published posthumously in 1923 by OUP, and reprinted by Paul Minet, Chicheley, 1972), 'The Mummers' Play'.