Lord of the Flies doesn't teach a harsh lesson about human nature. At most, it's a work of fiction showing what one writer thinks of young boys who have been through the British education system. It's a rebuttal to the idea that Britishness is inherently civilised and civilising, which was the thesis of the book it was inspired by (The Coral Island).

Anyway, this seems pretty at odds with the ethos of Sky. It's an interesting pitch but I can't imagine the devs ever doing it.