 Martha's television is branded Magpie Electricals—this company originally rented and sold televisions manufactured by other companies in the 1950s, as seen in "The Idiot's Lantern".The Master reveals that he was responsible for Tish getting the job working for Professor Lazarus—whose work he was funding—in "The Lazarus Experiment", hoping to trap the Doctor and Martha.In that episode a circular symbol can be seen throughout the main building featured, the same symbol is visible as being part of the Master's ring in this episode, a hint that he is connected to the Lazarus project.