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I think I can say for definite that there will not be a season 5 for Sherlock. It's been years since the last season but with Una Stubbs aka Mrs Hudson's death in her 80's on the 12th of this month I believe, I can honestly say we don't want another Mrs Hudson. Rip Una, as the 9th doctor liked to say, you were fantastic. And I'm sad to know you're gone.