For those of us without our pantos here in the USA, there's a book that might help: King Panto: the story of Pantomime by A. E. Wilson, E. P. Dutton, publisher, 1935. The English edition was called Christmas Pantomime: the story of an English Institution, published by G. Allen & Unwin. My library system owns it, so you should be able to get it on interlibrary loan. Delightful book, describing the whole operation, describing routines, naming and describing famous performers and genteely mourning the downfall of this institution by the influx of music hall performers and comedians who put in their comic turns and songs whether they have anything to do with the plot or not.