Clues to the key are in the text! I have no idea if this is difficult or not - to me all ciphers are 5 star, but then the cipher solving section of my brain appears to be missing. I will give it a 3 star and adjust as required. I don’t think I need to set up any verification as you have either solved it or it will be gibberish, but go ahead and e-mail if you want to confirm co-ordinates.
The cache is a small rectangular LnL.
Now, I am going right downstairs as Mrs BVPete has just cooked an apple pi and I want to get a piece while it is still warm. It is a constant challenge to keep the weight off around here with her excellent cooking.