David Tennant backstage during the Brit Awards 2008 in February.
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Weir talks with the actor about his meticulousness and his "steely" determination to succeed; the influence of his father, a popular Church of Scotland minister, on his drive and attitudes; his "metrosexuality"; and how tricky it is for celebrities to be involved even in causes they believe in.
Weir's interview complements her own assessments of her ex-flatmate, among which is her conclusion that Tennant's success "is down to a fusion of talent and unshakable self-belief."
Tennant, by the way, just turned 37 on Friday. Happy birthday, David. [Edited to fix lack of clarity about Weir.]