Souska John
From Tardis Wiki, the free Doctor Who reference
Souska John (born 1973) played a child in the Doctor Who television story Castrovalva.
She is the niece of Caroline John (who played Liz Shaw) and Geoffrey Beevers, though this had nothing to do with her getting the part. According to Fiona Cumming, the director who cast her, the relationship was not discovered until later in the production process.
