For filmmakers to bring their audiences along on a particular issue, they must first know very clearly where they are trying to go.

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And in terms of their use of media, they clearly know what they are doing or else this current debate would not even exist.

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But there is a question about public trust and confidence because one particular MP, Derek Conway, was you know clearly abusing the system and giving money to his family, when they weren't working hard for it and that was an abuse of public funds.

BBC: Harriet Harman interview

On the other hand Spotify is clearly an on-demand service and one needs to know exactly what they want to make good use of it.

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