Has anybody landed on there and had a look around
We're hoping to meet them with our Westerly out of Portishead (before we recently bought our Griffin we sailed a Drascombe Lugger out of Lydney), not sure what the anchorage is like though, or the wisdom of staying there overnight on anchor. Nobody I ask seems to have done it, which might be telling me something! Figured it would be very weather dependent, and have it in the back of my mind that if we were at all uncertain of our holding, we could head to Cardiff (or Barry, depending on tide?) for an overnight bolt-hole.
I anchored at steepholm last week. Despite big tides there a places where the stream is pretty slow. Not sure if Flatholm is the same though.
I have seen a mooring buoy on the North side, maybe you could use that.