sentences:  Story editor David Whitaker asked Hulke to revise his original storyline as he felt that the plot—with its many opposing factions—was too complicated, and that the serial's conclusion echoed that of "An Unearthly Child" too closely.It was hoped that an amended version of "Britain 408 AD" might occupy the sixth slot of Season One (Serial F), to be directed by Christopher Barry, but on September 23 it was decided that the production block did not need another historical story and Hulke's serial was abandoned.The spot in the schedule was ultimately occupied by "The Aztecs", while Hulke began work on "The Hidden Planet" instead (see above).