Cynthia is played by Lisa Palfrey
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Netflix's Sex Education: Meet the cast

16. Cynthia is played by Lisa Palfrey
Cynthia is the owner of the caravan park where Maeve lives and is played by Welsh actress Lisa Palfrey. She's best known for playing Maureen in 'Pride' (2014) and Gwenny in 'House of America' (1997). [Netflix]