Joe,
Thankyou, that's brilliant. It works as simply as that!
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For anyone else who want's to try it the only thing you need to know is how to dissable the built-in webcam on your laptop. Go into Device Manager, click on 'Cameras', Right-click on the entry for your buil-in camera and click 'dissable device'. This will cause the software to find your USB camera instead.
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Unfortunately my Black & Decker 'CrossHair' level doesn't produce a suitable beam, it's a series of dots even though the source inside appears to have a curved lens in front. Perhaps the family of MYCNCUK contributers can come up with a list of commercial laser levels that produce a suitable, unbroken line.

Kit