Phew. Have kind of ground to a halt. Can any kind person more advanced than I am confirm if 1a and 7a are 'misprints'? The next two I have identified are 26a and 28a. Ta.
A good puzzle but fairly hard going, for me at least! Am on the last clue but cannot parse answer. 33d : In charge in beginning, saving a tree (6). I have ST?IP? but none of the 4 possible answers seem to make sense.