London has endured many decades (Indeed you might even argue centuries) of terrorism. This might be classified as a war of sorts, but if so it is a low intensity one, that is not a comforting thought for those maimed or killed by it. However in real terms terrorism, as it’s name suggests, succeeds more on propaganda and fright than huge casualty figures. It is not the Third World War in any conventional sense. Also no-one is quite sure who planted this device, it could be anyone from Muslim extremists to dissident Irish republicans, white nationalists etc. etc.