Heather Jean Chasen (born 20 July 1927) is a Singapore-born English actress. Chasen is known for her roles in soap operas; playing Valerie Pollard in the ITV soap opera Crossroads from 1982–86 and guest roles in Doctors, Holby City and Family Affairs. Chasen also played many roles in BBC Radio 2's The Navy Lark from 1959–77, and appeared in the television series Marked Personal from 1973–74. She played Lydia Simmonds in the BBC soap opera EastEnders, a role which received positive reviews from critics, EastEnders cast members and crew. Furthermore, she has appeared extensively in theatre productions and film; in 2012, she appeared in a film version of Les Misérables.