Full details of the series can be found on the page for #1
From #6 Continue up the steps following the path.
You are looking for a 1.5L plastic container with a film canister within. Room for small TBs and I've left one in there to continue on it's journey. This cache is off the path to the LEFT.
Once you have found this cache, exit the woodland and keep left, over the style into the field. Just one more style should bring you back to the start.