In the course of googling HMS Belfast, I came across mention of USS Winston C Churchill. An active duty destroyer, the Churchill is the only current-service U.S. vessel named for a foreign dignitary and also the only one to be allowed to fly the White Ensign.

The ob-trav should be obvious . . .

Pocket Empire Captain: "But she blipped as flying under the enemy's ensign AND she's NAMED for their most famous Prime Minister!"

Pocket Empire Admiral, sighing in frustration: "Nevertheless, what you actually fired on was an IMPERIAL warship. And now we have THAT mess to deal with . . ."