From the last few down clue pairs, I have two sets of three words (7, 4, 5 and 7, 2, 5 where the two seven-letter words are the same). From the first few across clues, I have a seven letter word (possibly followed by a conjunction) and a six-letter (or possibly a hyphenated nine-letter) word. However, making sense of the middle pairs is proving very tough, and although I see how the words either side could form part of coincidences, I can’t see how the middle pairs would mesh with them. What level of accuracy is required – is one part in 60 enough or do we have to go to the next level (in which case we don’t seem to have enough letters)? I sense that I’m not far off, and I should be most grateful for confirmation that I’m on the right lines and, if so, a nudge to help me complete.