 A week after he had written the Shadow Proclamation scenes , Davies decided to rewrite the scenes heavily because of monetary and script constraints . Tovey 's cameo was replaced with a scene centred on the " Chief Constable " because he was unavailable for filming , much to Davies ' disappointment . The Dalek invasion was also rewritten to the version broadcast after he decided a personal assassination of the Prime Minister was uncharacteristically " diplomatic " , and recycled the Prime Minister 's name for " The Next Doctor " He also expressed doubts about the Shadow Proclamation to Cook ; he thought the Chief Constable was " terribly stripped down " , but admitted the Shadow Proclamation was a vital element of the plot . He decided to correct the faults in the Chief Constable by renaming her the " Shadow Architect " ( Kelly Hunter ) : 
