Good news. The faulty 2017 calendars have now been replaced by ones with a valid October. So the calendars are now available once again. You should be able to order in a local bookshop (you may need to quote ISBN 9781848258525, but it’s unlikely), or from one of the following:
Thanks to Canterbury Press, the publishers, for sorting this out.
If you bought a 2017 calendar before July 2016 check to see whether October is as it should be. If not you can contact Canterbury Press, who will send you a corrected one.