Cory Doctorow had an excellent commentary piece in The Guardian last week. It compares the message from the UK government in the past during times of conflict, versus the current message under the threat of terrorism. It's an excellent read that I highly recommend. To whet your appetite:
Back then, the government's message to the people wasn't "Take your shoes off" or "place your liquids in this bag". Instead, King George's printer stuck up millions of royal red posters bearing the legend "KEEP CALM AND CARRY ON."
Hat tip to Anton Aylward.