Page last updated at 12:12 GMT, Thursday, 17 February 2011

How Alternative Vote system would work and its impact

A referendum on May 5 will decide whether the UK changes the system for electing MPs. The public will be asked whether they want to replace the existing first-past-the-post system for electing MPs to Westminster with a method known as the Alternative Vote (AV).

Newsnight's Political editor Michael Crick explains how the system would work.

Read Michael Crick's blog.

Broadcast on Wednesday 16 February 2011.

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