Have previously purchased Lion via APP store and need to download again

We have recently rolled back our MacBook Pro to Snow Leopard (which came with the laptop) as we have had endless problems with Mavericks in using external hard drives and media servers on our home network. Basically it just does not work with them.
PLease advise how we can download Mountain Lion again, which we have already purchased.

Lion is no longer available in the App Store and it is no longer listed in my purchases, it was removed when I did the upgrade to Mavericks.
Well, that shouldn't have happened:
You may want to check whether they are just hidden from view:

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