Buzzb - I take it you know you can get the theme from the Listener web site, (which is how I know what it is about!)
If you are looking to be nudged, I would suggest thinking perhaps about three of the answers you have, -XO-, -BO-,
D-NE -M, and what might complete them , bearing in mind the two parts of the title.
Having said that I have not managed to find a complete list to confirm what all the rest are.