DOOMSDAY PREPPERS, National Geographic, 8.30pm
BRENT’S concerned about a nuclear bomb. This isn’t an irrational fear, given he lives in the US. His assessment of doomsday is Americans will become savages and go back to ‘‘ medieval’’ times, to the point where they’ll have to drive vehicles built before 1975. His chief worry is looking after his 10 children. They’re aged eight to 40.