Enjoyed this puzzle and almost finished it unaided.
Can't work out these two.
41a Language sometimes used by setter, often before breakfast (7).
Must be English. It's a language, and a type of breakfast, but I can't work out what the middle of the clue is doing.
45d Book with story about tree blaze (7)
Bonfire. Book is b, tree is fir but where's the story?