The official ratings for Amy's Choice have now been revealed and the episode was watched by a total of 7.55 million viewers. 7.06 million watched on BBC One while an additional 0.49 million watched on the BBC HD Channel.
This is another example of why you shouldn't panic at the unofficial overnight ratings. Amy's Choice originally had overnight ratings of 6.2 million, so it usually increases! Hopefully this week's 4.5 million will too.