Terrain LOD when created in scene editor

There are code examples for getting terrain LOD working when the terrain is created in code but I have terrain that I loaded from a heightmap into the scene editor, I notice it already has a TerrainLodControl, but it doesn’t appear to be doing anything when I run my code.

Are there any steps I need to take to make it work? Do I need to add cameras to the existing LOD control somehow as in the examples?