How do you format/reinstall Lion on an iMac which came with no disc?

Hi,
How do you format and reinstall Lion on a iMac which came with no disc? It was purchased new from an Apple store but came with no disc.

https://discussions.apple.com/thread/4177979 - Reinstalling Lion on a computer that originally came with Lion installed.
How to deal with future problems without a Lion Install Disk - https://discussions.apple.com/thread/3552183
How to reinstall Lion on a new drive? - https://discussions.apple.com/thread/3570140

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I guess I'm not the first one with this question but anyway...
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Obviously I needed to upgrade it with larger SSD 1Tb and install Windows 8.1 Enterprise as I need Hyper-V and other Enterprise version functionality on day to day bases.
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Dj Generator wrote:
[There] must be other options, i would rather not spend £70 on a disk drive or £140 on the software again??
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How do you format/reinstall Lion on an iMac which came with no disc?

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