The British frigate HMS Lancaster has kept busy during its ongoing Caribbean patrol, managing everything from helicopter-aided pot busts to community-works projects on the island of Montserrat. These activities — along with every other activity that isn’t related to Prince What’s-his-name — have gotten little play in the British press recently. But the photo above, of the Brits aboard Lancaster spelling out a fairly succinct royal birth announcement, did get some media attention — the news agency Reuters released it, for example. Here’s another shipboard shot, via Reuters and the BBC. U.S. forces have yet to spell out any warm…