It's always hard to say how much this kind of personal branding contributes to the success of a business, especially one like fish-farming that's easy to enter but hard to master.

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But the split would leave Netflix with one business that is probably going to shrink DVD-by-Mail and another that ought to be growing fast but is going to be hard for Netflix to master.

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In fighter pilot training school he had to practice twice as hard as others to master the same maneuvers.

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With 1Password, you'll only need to memorise a single master password to have one-click access to your database of usernames and passwords, which is safe if you make that master password hard to guess.

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When he first moved into management he proved to be an equally hard task-master.

BBC: Time mellows football's hard man