Ultimo (brand) models Kelly Brook and Helena Christensen, actresses Gemma Atkinson ("Ultimo D-G cup"), and Kara Tointon ("Michelle for George"), singers Mel B and Samantha Mumba ("Per Amore)", television presenters Jenni Falconer, Peaches Geldof, Melinda Messenger, and Melanie Sykes. As of January 2015, the current Ultimo model is Petra Nemcova. The first Ultimo girl was Scottish model Mary Kennedy, but after the brand went global when Julia Roberts wore an Ultimo prototype in "Erin Brockovich" Penny Lancaster, the future wife of singer Rod Stewart, became the first high-profile Ultimo girl. However, she was replaced a year later by Stewart's ex-wife Rachel Hunter.
Things Which Have Never Yet Been Done was shot with a handheld camera by the episode's director, TJ Scott, with Maslany and Outerbridge improvising the dialogue and use of props. The subsequent shot of the barn on fire was created by the visual effects company Intelligent Creatures. The title of the final two episodes, "Things Which Have Never Yet Been Done" and "By Means Which Have Never Yet Been Tried", are taken from a Francis Bacon quotation in his philosophical work "Novum Organum": "It would be an unsound fancy and self-contradictory to expect that things which have never yet been done can be done except by means