Camulodunum also have possessed ports for the colonia. Imports of dates, wine (including Falernian wine), olive oil, jet, marble and other goods from across the Roman Empire have been found in Colchester, including a locally made amphora with an inscription suggesting that it held North African palm-tree fruit products. The trade in salt from local Red Hills also appears to have continued on from the Iron Age in the Roman period, but with more sophisticated evaporation kilns. Small numbers of tiles were imported from Eccles in Kent by Roman settlements in South-East Britain, including Camulodunum, for a brief time in the
A Town Called Mercy called the Gunslinger. However, the Gunslinger is a product of experiments by Jex to win a civil war on his planet, and the Doctor is unsure of what is the right thing to do. Showrunner Steven Moffat pitched the Wild West theme to Whithouse when thinking of ways to give each episode a distinct theme. Whithouse further developed the theme, including classic Western tropes and a sympathetic villain. "A Town Called Mercy" and the previous episode "Dinosaurs on a Spaceship" were the first to enter production for the seventh series. Much of the episode was filmed in March 2012 in