Scotland does not have 8.4M people, it has around 5.5M people.
Can you post a source for the 5500 claim? For reference, we had around 5500 deaths in Scotland in total for 1 March - 4 April [1], so to get an extra months worth of deaths would be a big deal.
No, they can't, because they're mindlessly repeating FUD they heard 7th hand from some apoco-preppers pro-trump blog and they are on their way to purchase beef jerky, shovels, ammunition and toilet paper so that they're ready for the big one.