Hi, everyone, it looks like a pretty standard post Roman Julian
Labyrinth. They were quite common in medieval Europe, especially near priories and monasteries and there was one in the village of Alkborough in N Lincs where I used to live. They were situated above a commanding view, usually, because the monks would do their penances by walking to the centre and then back again so many times, a bit like Hail Marys, but had the view to enjoy whilst contemplating their sins. The church in Alkborough has the pattern for the maze engraved into the entrance floor, filled in with lead and it was used as the master plan to recut the turf-cut maze about 1/4 mile away should it become over grown and need re-marking . Perhaps the one on FV has been done in stone in an incongruous place and intent with the original meaning forgotten?
http://www.stone-circles.org.uk/stone/juliansbower.htm
The view is just stunning from the seat near the maze/labyrinth: 300ft below you and a mile away is where the River Trent and Yorkshire Ouse run into the mighty Humber estuary, home of Eigir, the Norse storm god, his wife Ran, goddess of the drowned-dead, and their children, the three Billows. It's called Waters meet or Mead and on a good visibility day you can see York Minster 40 miles away.
Here's a better view from the seating:
http://www.northlincs.com/alkborough/juliansbower.htm