In reply to Roberttaylor:
The cost would be massive - lots of exotic locations, hundreds of extras and costumes. Also, even if the money was available, if the adaptation was faithful to the books, the tone would be very tricky to get right. Flashman is a venal, cowardly, treacherous, sexual predator (an actual rapist in one of the books as I recall). For me, he works within the novels because his redeeming features are also evident - honesty about his failings, sense of humour, intelligence, appreciation of other cultures - and those traits, with his desire to save his skin, often yield a believably realpolitik outcome. I think it be very hard to get that across - without removing any of the harsher edges and reducing it to "Confessions of a carry on up the Khyber".... in which case I'd far prefer the books to be left alone.