You can do this cache in the order suggested , or in reverse. The latter may be preferable if you are also doing Forgotten East Lothian Castles: North Berwick.
The Old Toll House
N56 03.167 W002 42.281
There is a plaque at the side of the roundabout on the site of the old toll house. The plaque tells you that to the East is Tantallon Castle. Approximately how many miles away is it = A?
What is the third number directly after the words "The Law" = B?
Travellers entering North Berwick from the East had to pay a road tax. Road tolls were abolished in 1869. Which line of text is that date on = C?
The next clues can be found on the information boards in the glen, so it may be worth looking at the map showing you their locations.
Birds of the Woods
N56 03.200 W002 42.249
How many pictures of birds are there (don't count the East Lothian council icon!)= 1D?
A Natural Woodland?
W56 03.242 W002 42.166
How many different kinds of trees' leaves are illustrated (don't count buds!)= E?
A Walk Back in Time
N56 03.312 W002 42.210
This is the location of one of the mills in the glen. A mill here was first recorded in 143F.
Nature's Sculptors
N56 03.349 W02 42.248
How many diagrams are there = G?
The cache can be found at:
N 56 03. GB(E-F)
W002 42.(C-E)(D+E)(A+E)
The final coords were very difficult to get in this location but the clue will help.
You can check your answers for this puzzle on GeoChecker.com.