So Bill Mason randomly meets his dad. He is heading out to a his dad's house, but meets him far away just tooling along the country roads. (Also, his dad "discovered" Triffids.)
And -- again with the guns in Britain. Even the children have ready access to fully automatic machine guns. And, seemingly, expert knowledge in their use.
Too bad they didn't set this in America, because then there would have been fewer guns.
Maybe this is some sort of British Gun Lobby agenda film?