I don't know why but I found the crossword this week a bit underwhelming. This theme has come up before, I'm sure.
Anyway, grumble over. I have finished the grid save for 34d. I'm pretty sure of 37a and 39a for the checked letters. Maybe I have got 40a (unclued) wrong; I have an 'oceanic' related answer. Whatever, there is no word in Chambers to fit 34d.
Could anyone offer a hint please? Thank you