Highlights the importance of representation and how far media texts go to provide an accurate representation. In this case Downton wants to present an accurate representation of that historical time.

http://www.dailymail.co.uk/femail/article-2837699/No-slouching-no-gloves-table-definitely-no-hugs-s-don-ts-Downton-Abbey-etiquette-revealed.html
(Representation is the re-presentation of ideas/ places/ times etc)