I listened to Walking to Babylon - it was quite a good audio, I enjoyed hearing more of Benny (I actually do love her now!), and it was interesting about the Time Rings (I haven’t read the story where they got them, might have to go back and do that one day).
Elisabeth Sladen was also in this! 
The actual story/plot was a bit ‘meh’, but in the end I enjoyed it because of the performances.
Onwards, to the next of the Time Ring Trilogy!