Welcome to MR, daveconifer
Thank you for letting us know about your book on smashwords. It is always nice when author members make their work available in a variety of formats (and free too!). If you have viewed the main forum threads you may have noted that we are international with a variety of devices.
We love to support author members who participate in our forums, so pull up a chair and go exploring. Jump in and ask questions, especially if you would like to know more about other devices and formats. A friendly forum member will jump in with an answer and / or point you in the right direction.
P.S. Have you discovered our free ebooks that have been beautifully hand formatted by some very dedicated MR members?