Even if you believe that the Falklands/Islas Malvinas are as British as Finchley, the memory of the 1982 sinking of the ARA General Belgrano and the 323 lives needlessly taken must be disturbing. Britain has, since then, engaged in several conflicts that might be termed legacies of empire or at least the psychological legacy of empire. It may be on the cusp of doing so again, this time with Iran.