Locus1 tells us that this is a pseudonym for the combined efforts of "The Oxford SF Group". "M H Zool" stands for <i>Massed Hordes of Zool</i>, SFE3 informs us. identifies Mo Holkar, Ivan Towlson and Neal Tringham as three of the actual authors while noting that there are other authors they do not list. adds Tim Adye, Matt Bishop, John Bray, Malcolm Cohen, Adrian Cox, Paul Cray, Melanie Dymond, John Grandidge, Penny Heal, Colin A. Johnson, Simon McLeish, Paul Marrow, Phil Raines, and Chris Williamson.