Tam trained at Guildford School of Acting in London.
Tam's grand-father, 'Hugh Williams (I)' (qv) (1904-1969) was an English actor and dramatist of Welsh descent and was nicknamed Tam. Tam is named for him.
Son of 'Simon Williams (I)' (qv) and 'Belinda Carroll' (qv). Grandson of 'Hugh Williams (I)' (qv), 'Margaret Vyner' (qv) and 'Hazel Bainbridge' (qv). Nephew of 'Hugo Williams' (qv), 'Polly Williams (I)' (qv) and 'Kate O'Mara' (qv). Brother of 'Amy Williams (I)' (qv) and stepson of 'Lucy Fleming' (qv).

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