was also released onto VHS video, by Clear Vision Video. It was then added as a DVD extra, on the Series 4 DVD release by Network. Series 4 (1991) In 1991, LWT commissioned 10 episodes for Series 4, which became the most popular series of the drama. Paul Knight had appointed Brian Clark as the Fire Brigade Advisor and, along with the writers and directors, he decided on a climax to the fourth series. The psychological state of one of the main characters deteriorates after being buried alive under a collapsed wall whilst at a spectacular 20-pump warehouse fire. Series 4's climax won the programme its record rating of 18.86 million viewers. Series 5 (1992) Each series now included a major disaster or "shout". In Series 5 (1992), a spinning wheel ride at a fairground is jammed by a troublesome youth (played by Liam McGuire) armed with a pole. The ride collapses, and there is a huge fire with people trapped in the crushed metal. The series attracted 17 million viewers. Series 6–9 (1993–1996) In the early 1990s, the ratings averaged 17–18 million viewers. In 1995 (Series 8), ratings fell to 16 million viewers. Paul Knight decided it was time for a real shock—a tragic exit for one of the main characters, who had starred in the show for nearly ten years. The man who was to be killed was Sub Officer John Hallam—a dedicated and loyal member of the watch and the London Fire Brigade. Hallam was killed off in 1996 (Series 9) during a huge warehouse fire, where he and his colleague, Leading Firefighter Geoff Pearce, were attempting to rescue four teenage girls on an unstable gantry above a blaze in the basement. Hallam held the gantry steady for Pearce as he walked across with one of the girls. As Hallam attempted to cross, the gantry cracked and Hallam fell to his death. The writers developed a storyline about Pearce feeling an overwhelming sense of guilt after the accident, which would lead to him considering a transfer. Series 9 attracted 16.8 million viewers. Series 10 (1997) Series 10 was the last series produced by Paul Knight, who left to produce episodes of The Knock. Budget cuts led to a small number of scenes being done with computer-generated imagery. Notable 'shouts' included ones at a paint factory and another at a bus depot. With 18 episodes this was the