I have completed the grid apart from 30a, which is driving me up the wall. I also have the speaker and all other aspects of the extra letters. Now onto the end game, which is taking me longer than the solving of the clues.
Stuck on extra letter in 30a. Can’t make sense of ‘what ruined a …’ Also although I have the instructions for how to resolve clashes, I don’t know how to do it! Please send help!