Paul is right about this sort of scenario being drip fed for months (if not years).
We have no army/navy/police in any great number, we have very little food reserves, water is getting to be a problem, power is a complete shit show (even after all the money thrown at the 'clean options).
Government (and previous) have taken their eye off the ball . . probably due to kicking it into the long grass.
I'm not worried about the thought of foreign attacks, I'm more worried about when the people here who have bugger all decide to take what they want . . . with violence