Heather Jean Chasen (20 July 1927 – 22 May 2020) was an English actress, known for her roles in soap operas; playing Valerie Pollard in the ITV soap opera, Crossroads, from 1982 to 1986 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 to 1977, and appeared in the television series Marked Personal from 1973 to 1974. She played the recurring role of Lydia Simmonds in the BBC soap opera EastEnders, a role which received positive reviews from critics and EastEnders crew and cast members. Furthermore, she appeared extensively in theatre productions and film; in 2012, she appeared in a film version of Les Misérables.