Thanks for the reply. Only found it today.
The problem is I’m looking at quite a number of parts of the country and possibly a number of properties in each.
Have you any idea of the origin of the within 5m of the curtilage rule when no planning permission is required? I could understand 2m if your neighbour might need access to your property to maintain his or even if there was mains voltage about, but 5m seems to suggest that an installation shouldn’t overwhelm a property except its roof.
For instance, I’d think this back garden “ledge”:
might be ideal for an installation, but I don’t know that the neighbours or Cornwall council would agree. They’d prefer the sight of sweaty sunbathers!?