Using mopidy/musicbox for Spotify audio books

I’ve just realized that Spotify have quite a range of audio books and I’ve been trying it out, however the problem arises if I listen to a few pages then use Spotify to play some music, when I go back to the audio book it restarts at the beginning of the book.
Is it possible to bookmark where I was in the audio book to go straight back to it?
I guess I could use mpc seek, mpc play, but would need to know the time to seek for and am not sure how to arrive at that time, or even if this would be the most effective method.
I’m using Musicbox 0.6
Thanks for looking - any ideas welcome.