I have nearly finished this puzzle, but still have two outstanding issues. Firstly, I cannot see the significance of the words omitted from the across clues, although this appears not to matter. Secondly, I cannot solve 29 across. I can only assume that it is not too difficult as it has not previously been mentioned in this thread. I believe it will provide the ninth thematic item, in which case, it would need to accommodate an eight or twelve letter word, which it clearly cannot do. I am now beginning to wonder if I have got some of the other eleven thematic items wrong.