Zoom: Once you have pulled our perimeter back to coastal waters, any country wishing to defeat Britain can do so without ever coming anywhere near us, by thousands of miles. Or perhaps you think this nation is self sufficient in food, fuel and materials. It is not. Our Achilles heel is our complete reliance on overseas trade, just as it was in WW2. An enemy does not need to be a nation with submarines, just terrorists with the means to plant bombs on cargo ships. I know how lax British port security is today, and we are supposed to be a lot tougher than most of the nations we trade with. What use is a Typhoon without fuel for it's engines or food for it's crew?