The first place to visit is the delightful little hidden beach of Garwick, with its lovely boathouses. This is where the cache coordinates take you. There is no longer a container at the location: it's just an intermediate waypoint. From here use the "Final cache" coordinates to find the box (N 54° 12.218 W 004° 24.045).
Although you can drive down the steep and narrow lane to the beach, it's better to park at one of the parking waypoints provided, and walk down. There is alternative parking near the cache coordinates: but there is only room for one or two cars, the approach is very rough, steep and narrow and it's difficult to turn if there's another car down there. Don't risk it!
The final container is a regular box, placed at the back of a secret beach.
Keep as far back from the sea as possible and there is a bit of a path, with some steps and two "Needle Eyes" to negotiate. The going is very tricky and slippery in places so only attempt this if you're sure-footed. But it's worth the effort!