Diana Hardcastle è nata il 12 luglio 1949. Luogo di nascita: Inghilterra, Regno Unito. È conosciuta come attrice. È celebre per aver partecipato a Marigold Hotel (2011), I Kennedy (2011) e The Boy (2016).
Went to Witney Grammar School, Witney, Oxfordshire, where she was
studying science A-levels in order to be a doctor, when she was cast as
the lead in Hedda Gabler and was astonishingly successful. She dropped
her science A-levels and started again with arts subjects, eventually
going to RADA and becoming a member of the RSC.