I went to the exhibition that ran along side the showings of the films. The small exhibit featured the continuity work of Ann Skinner and featured polaroids and script details. The polaroids featured Blockade Runner, Cantina, Toshi Station, Trash Compactor, Rebel pilots.

Some of the polaroids and script details are here.

http://www.bfi.org.uk/news-opinion/news-bfi/features/set-star-wars-episode-iv-new-hope

http://www.dailymail.co.uk/news/article-2845532/The-force-ve-never-seen-Incredibly-rare-pictures-filming-Star-Wars-revealed-new-exhibition.html