Furthermore, a determined adversary with a well-funded and well-prepared attack wouldn't just attack the financial services industry, they'd attack other key in

Furthermore, a determined adversary with a well-funded and well-prepared attack wouldn't just attack the financial services industry, they'd attack other key industries. So for example, their are 9 major oil refineries in the UK. If they could all be put out of action with Stuxnet-style attacks (or maybe with precision cruise missiles), then 2 weeks later the UK runs out of fuel and supermarkets run out of food. Or consider an attack on the internet infrastructure itself. Since we're envisaging an attack in the future, when TV, radio and telephones are just services that run on the internet, bringing down the net will destroy communications. And the end-pints -- computers in homes and offices -- will themselves be down. Societies are only going to get more dependent on computers, and computers are only going to get more complicated (making logic bombs harder to find). The damage that a cyberspace attack could do, and the ease of pulling it off, will therefore both only increase.