What did kill Lady Sybil ?

I mean, sure post Edwardian Kyle would have died at the mere mention of albumin spilling into ones urine - but turns out Sybil had a real thing .

Wapo spills the tea.

By the way, THIS is what the OH so cute Mr. Branson looks like when he is in the role of Allan Leech at last nights SAG awards :

seen here with Mrs. Huges.
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