agreement with the actors' union Equity to cease offering walk-on drama series roles to members of the public as prizes. When an untrained person won such a role in Holby City in a competition, Equity complained to the broadcaster that such prizes were "demeaning" to actors, depriving them of paid employment. The competition winner was allowed to visit the Holby City set, but did not appear on-screen as a result of the policy change. Adaptations and other appearances Casualty@Holby City Reflecting Holby City origins as a spin-off from Casualty and the closely related premises of the two programmes, the BBC has screened occasional crossover mini-dramas entitled Casualty@Holby City, featuring a number of characters from each of the two casts. Prior to the commissioning of Casualty@Holby City, the two shows had occasionally crossed-over storylines and cast members before; for instance developing a romance between Holby City Ben Saunders (David Paisley) and Casualty Tony Vincent (Lee Warburton). The first full crossover was spearheaded by Casualty executive producer Mervyn Watson, and Holby City McHale. Logistical difficulties arose from the fact the two series are usually produced 120 miles apart, and work on both shows had to be halted for two weeks to release a number of cast members to appear in the special. A second crossover was commissioned in 2005 as part of the BBC's DoNation season, aiming to raise public awareness of organ donation and help viewers make an informed decision about whether to sign up to the Organ Donor Register. An interactive episode of Casualty@Holby City was one of the headlining shows of the season, allowing viewers to vote by phone to determine the outcome of a fictional organ donation. The third Casualty@Holby City crossover aired in October 2005. The four-part storyline tackled the issue of youth violence, following the events of a turbulent A&E demonstration at an inner-city school. Based on the success of the 2004 Casualty@Holby City Christmas special, another crossover was ordered for Christmas 2005. Rather than dividing the episodes between the two series' crews as had previously been standard, this crossover operated as an entirely separate production, with Kyle producing and Paul Harrison directing. In February 2010, another crossover occurred when Casualty Charlie Fairhead (Derek Thompson) was operated on by Holby City Elliot Hope after suffering a heart attack. The storyline was, however, broadcast as regular Casualty and Holby City episodes, rather than under the Casualty@Holby City