For Big Finish Productions range of audio dramas, based on the television science fiction series Doctor Who, she played the part of Sister Jolene in Excelis Dawns in 2002.
In 2002, Posy recorded some video diary material for a speculative TV drama promo made by Molehill Productions.
After her death, the production team used the tapes as a centrepiece for a new script, which began filming in 2004 and co-starred many of Posy's actor friends.
The completed film is thought to be the first ever movie to be made starring a leading actor who was deceased before principal photography began.
The film was finally released on 28 December 2007, after being delayed for several years by music licensing problems.