Question: The Jaguar C-XF, was a concept car that was designed to showcase the preliminary styling cues of which yet to be announced executive/mid-size luxury car, and estate produced by which British car?
Sentence (from "Jaguar C-XF"): The C-XF was unveiled in the 2007 North American International Auto Show with the production XF announced in the autumn of 2007 at the Frankfurt Motor Show.
Relevant evidence: No