We are, famously or notoriously, a warrior nation. From the 18th-century continental wars to the imperial battles, the world conflicts, and the post-colonial fighting of our own times, the British have prided themselves on being first with the bayonet. Our royal family and many of our national occasions are tightly interwoven with militarism. Our bookshops have more books about military history than any other kind put together. Yet we are changing.