We've been to South Cave. It's not a hole in the cliff (though there is a place call South Cliffe close by), it is a small town in the East Riding of Yorkshire. Some of the villages in the area are at least as big, but it is a town, with a town hall too.
It was very straightforward, the streets were pretty quiet and most of the layouts of the roads were simple. The name boards were easy to find with little ambiguity. This was not what I was expecting, which is why I have put off mapping the place.
Sorry South Cave, you should have been on the map sooner, I got you wrong.