To tie up a couple of loose ends:
Can anyone please help me parse 8d? I have the first 7 letters as an anagram (over) of a first name minus the first letter (after heading). That leaves the last two letter, plus the superfluous letter (which I have), to mean ‘bar’? Or is my reasoning completely wrong?
For anyone who’s bothered to find the groups in the grid: I can’t make the 40-letter version work without the extra letter touching a T from one of the others, which seems to go against the instructions slightly. Still unambiguous without having to find the, though, as has been mentioned.