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I did see that thread, but as the novel wasn't self-published it didn't seem relevant.
I will double check the contract. Appreciate your time :)
The most important thing is to have a close look at what your contract says. Some self-publishing contracts state that an author has to notify their publisher of their intent to break their agreement at the end of the contract term, otherwise it continues rolling. You should also check to see what, if any, rights they retain after the contract expires (ebook for example).
If you're confident that the contract you had with your previous publishers has expired, and has by expiring reverted the exclusive worldwide right to publish your title back to you, thereby leaving them with no legal entitlement to the title in any form of media, then you are more than welcome to submit your work to WEbook for consideration through PageToFame and other channels, such as the Monthly Challenges.
For more detailed information about this, please take a look at the FAQ entry: Can I post a book or content I've already self-published elsewhere?