Dear mandyrob0704,
I think that everyone has had to concentrate hard on which number must be entered where. The answer to clue A is the six letter number, and this is entered at A. Work out the alphabetical sum of the distinct letters (ASDL) of this wood, and you get the answer to clue n. This number has 10 letters, and its ASDL is the number to enter as the answer to clue G.
The number to be entered for clue b has nine letters when spelled out. The ASDL of this number is equal to A+G. I worked out B and little b (the wretched autocorrect thinks I’m trying to type B and B) by noting that the ASDL for the answer to clue K is equal to both B-b and d+G. As d is the ASDL of G, I could work out B-b, and this constrains the possibilities for both B and little b to three each. Calculating all six ASDLs and a little logic led to unique solutions. This was the trickiest bit of my solution, and the rest was plain sailing.