BBC launched the twice-weekly soap opera EastEnders (1985–present) and the medical drama Casualty (1986–present), both of which remain linchpins of the BBC One schedule today and the highest-rated drama productions on BBC television. Indeed, EastEnders achieved phenomenal success in its early years, its Christmas Day 1986 episode earning a massive 30.15 million viewers, the highest British television audience of the 1980s.Aside from these continuing dramas, based in one major location and shot entirely on videotape and thus comparatively cheap to make, longer runs of drama series became rare, with short series of six or eight episodes becoming the norm. The single play, in its original studio-based form, also began to disappear from the schedules, with the final series of Play for Today airing in 1984, and the last single drama recorded at Television Centre being Henry IV, Part 1 in 1995. The BBC was envious of the success of its rival Channel 4's newly formed film arm , which had seen made-for-television one-offs such as Stephen Frears' My Beautiful Laundrette (1985) gain cinematic releases to considerable success. New strands such as Screen One and Screen Two concentrated on short runs of all-film, cinematic-style one-off dramas, with the most successful of these being Anthony Minghella's Truly, Madly, Deeply (Screen Two, 1990) which became a successful film released to cinemas. (Screen One and Two ran until 1994.) The Plays department eventually disappeared altogether, being replaced latterly with a 'Head of Film & Single Drama' position with autonomous powers for investing in feature film production, co-commissioning television one-offs with the Head of Drama. This interest in film production is perhaps best demonstrated by the fact that both of Powell's successors as Head of Drama, Mark Shivas (1988–93) and Charles Denton (1993–96), went on to work in the film industry after leaving the position. Another major change to BBC production methods in all areas, but particularly affecting drama, occurred the passing of the Broadcasting Act 1990, which amongst other things obliged the BBC to commission 25% of its output from independent production companies. Many BBC drama productions were subsequently outsourced to and commissioned from independent companies, although the BBC's in-house production arm continued to contribute heavily, with the separate Drama Series and Serials departments remaining intact. Production arms such as costumes, make-up and special effects were all closed by the early 21st century, however, with these services now being bought in from outside even