This is late!
I should've posted this last year in the week following the final episode of the series. These are the six covers I produced for series 13. It would be interesting to see how Target would've handled this back in the day - six short novelisations (more profitable) or a single big one (probably more logical for a six part story).
As for the episodes, I really enjoyed this series. Some great visuals, a far ranging story packed with colourful characters and some great twists along the way. It certainly corrects the issues I have with the last two series.