hello, i think i read that "essential bushcraft" is basically the same book with a couple of additions and a few less pictures, it is also smaller, so more of an "in your pack" rather than "on your coffee table" book.
I'm not 100% sure as i don't have "bushcraft" but hopefully someone will confirm, I can say that "essential bushcraft" is a good book with lots of practical and interesting info. If you search the forum i think there's a few threads with various opinions about which of his books are the best.
If you are really struggling to find a copy of the one you want i can probably help by buying and mailing you a copy for whatever that costs but you'll end up paying more in postage.
cheers
edit- although going by tomtoms post it may not be available here either!