Miller made his television debut with an uncredited appearance in the BBC series "Doctor Who" at the age of nine in the 1982 episode "Kinda". The following year he appeared in "Jemima Shore" and had a role as Charles Price in the serial drama "Mansfield Park". In 1991, he costarred, with Alexei Sayle in 'itch, which was broadcast on Channel 4 as part of the 4 Play strand, a platform for a series of one-off plays that ran from 1989 to 1991. The play was written by Alexei Sayle and David Stafford. Miller played the character Dennis Turnbull, the teenage son of Gordon and Susan Turnbull. He then appeared in various television shows throughout the 1990s. These included "Keeping Up Appearances" in 1990, followed by "Inspector Morse" and "Minder" in 1991. He appeared in two separate guest roles in the ITV police drama "The Bill", one in 1991 and another in 1993, as well as single-episode roles in the BBC drama "Between the Lines" and the medical drama "Casualty", both of which were broadcast in 1992.