Theory:Doctor Who television discontinuity and plot holes/Ghost Light


 * After having been given considerable screen time in Episode One, Redvers' glowing snuffbox disappears from the plot. No reason is subsequently offered as to why Josiah would want to trap his non-expendable would-be assassin in a room with an exposed radioactive source.
 * Why does Josiah think that killing the Queen will mean that he takes over the Empire?
 * Because he's an alien who doesn't understand how the line of succession works. He's operating under the assumption that he can 'evolve' through natural selection to the top of the food chain.