In this
http://en.wikipedia.org/wiki/Battle_of_Britain#Air-sea_rescue:
"The Air Ministry issuing a communiqué to the German government on 14 July that Britain was unable, however, to grant immunity to such aircraft flying over areas in which operations are in progress on land or at sea, or approaching British or Allied territory, or
territory in British occupation, or British or Allied ships. Ambulance aircraft which do not comply with the above will do so at their own risk and peril."
How is "territory
in British occupation" different from "territory
under British occupation"?