- One of the founder members of "Shotgun" a theatre company founded by actor Tom Hardy.
- Sang in jazz bars in London and waitressed to support herself through drama school.
- Is a published artist.
- Daughter of Donald Hewlett and Therese McMurray.
- Trained at the Webber Douglas Academy of Dramatic Arts, whose alumni include Hugh Bonneville, Matthew Goode, Minnie Driver and Julian Fellowes.
- Performed in her theatrical debut with Irish actor Chris O Dowd in London.
- In 2014 Siobhan set up Rabbit in the moon productions with her brother Patrick Hewlett.
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