This is my first ever attempt at a Puzzle Cache, I wanted to utilise smartphone technology hence the use of the QR code in Balgray 1. You will need a barcode scanner app on your phone. If you can scan the example QR code below then you are good to go :)
Balgray Bonus Puzzle cache
You must visit all four Balgray caches to solve the puzzle cache
Balgray 1 - Use QR code
Balgray 2 - Add the numbers and letter together answer replaces the question mark. Letter is the number in the alpahabet = 4° 2*.?**W
Balgray 3 - Number of flowers on one side of the bridge answer replaces the question marks = 55° 5*.*??N
Balgray 4 - Add the following distances together from the signpost, the answer replaces the question mark = 55° 4?.***N
Priesthill & Darnley Station
Nitshill Road (Darnley)
Darnley Mill
Waulkmill Glen Resevoir
Add all three numbers together on this distance answer replaces the question mark
Balgraystone Road to Barrhead = 4° 2*.*?*W
If you have done this correctly you should now have the co-ordinates of the bonus cache
55° **.***N
4° **.***W
Good luck

QR code sample. ENJOY.