Why leave downton?
It's a sweet gig
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An alcoholic is someone you don't like who drinks as much as you do.
Apparently not so much. This is her own quote from the quotes section on her IMDB page:
"I signed up to do three [seasons of Downton Abbey (2010)] and that was all I wanted to do. I had great fun doing it but I just didn't want to do it any more. I decided this before we even did the last series. When I stop loving something, I stop doing it."