she was a cast member of bbc one's bafta-winning medical drama "casualty", playing dr maggie coldwell. this was cookson's second role on the programme after appearing in series 13–14 as an occasional character, anaesthetist julie day. she returned for one episode at the end of march 2009 on the day that co-stars janine mellor and ivana bašić left the series and returned once again in march 2015 for one episode.