Hello RWimborne,
Although the Mp3 upgrade patch does not work in Wavelab LE, the .wav format is usable. If you imported an Mp3, you must convert the mp3 to the sample rate of the session before it will allow you to export. Before I give you more detailed instructions. I need to know the following for your system.
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What operating system are you running? (PC: Start>Computer, right click to select Properties) (Mac: Go to Apple Icon>About this Mac)
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Are you running Wavelab LE7 or LE8 and what build version?
This is important to know in providing you a more accurate response.