Robin would have been used to owls in the woodland, probably being able to spot them during the day - even though they are often very well camouflaged! The stream across the road from here is "Owl Sick", but I don't think it was named because of any avian disease. The term "Sick" in this context seems to be a Derbyshire word for a small stream or tributary.
The coordinates have been averaged over three days so should be quite accurate, but tree cover may interfere with the signal so you may find that the search area is fairly large. However, the container is also quite sizeable - bigger than a micro anyway.
Although you might be able to drive closer, I strongly recommend using the nice big car park nearby and walking the short distance to the cache zone. The road is very narrow and quite busy.