The island of Garinish West as seen from Zetland jetty
I have heard it very recently (Aug 2014) from the most august local authority imaginable (Sir Cosmo Haskard of Tragarriff) that Garinish West is owned by the British Astronomer Royal, as also is much of the shoreline of Zetland itself.
It's not the sort of thing that you would make up. But maybe it was recollected from way back. I've not been able to verify it from the internet, but that by no means discredits it.