Cressman was trained as an actor at the
Guildford School of Acting. In 1995, Cressman played
Kate Lethbridge-Stewart in the
Reeltime Pictures film
Downtime. The film also starred
Nicholas Courtney as
the Brigadier and
Elisabeth Sladen as
Sarah Jane Smith. In 1999, Cressman appeared as a driving instructor in the TV series
Grange Hill. In the same year Cressman played Debbie Hunter in the
Pig Heart Boy episode
Losing It. Cressman played the role of Kate Lethbridge-Stewart again in the 2004 film
Dæmos Rising. She starred in this film alongside her then husband
Miles Richardson. In 2012, the then current
Doctor Who production team decided to re-introduce Cressman's character. The role was re-cast and given to
Jemma Redgrave. In 2018 it was announced that Cressman would reprise her role as Kate Lethbridge-Stewart in the Reeltime drama film
Anomaly. Cressman also works as a voice over artist and a
QVC guest presenter. Furthermore, she voiced Clarissa Jones in
Big Finish's
Death and the Daleks and Doctor Carnive in
The Mirror Effect. == Personal life ==