I've just caught up with the other contributions. They get NIL points because some of them made me splutter my heavily laced coffee all over my nice shiny new keyboard!
But coming back to the discussions on CY 4+ 4 = 0. Had a look last night and it's finally sinking in that the Orams case was based on the matter of Trespass and had nothing to do with "ownership" (which has never been in dispute, refer to "74 kochans).