You can expect a pretty hefty fine and endoresement because you are way over the maximum limit. My advice is not to appeal - they've heard every excuse in the book, and you don;t want to wind them up in case they increase your fine. Your argument regarding conditions and placing of the camera cut no ice with the law I'm afraid, the limit is there, you broke it, and after that, you and the law makers part company on the whys and wherefors. I'm really trying not to sound superior and patronising here, mainly because I am neither by nature, but my advice is to pay up and forget about it.