Noah's Castle (1980)

IN LAWLESS AND HUNGRY BRITAIN A FAMILY FIGHTS TO SURVIVE

The father, an ex-military man, sees the 'handwriting on the wall' as to where his country's economy is headed. In an effort to prepare for this, he moves his family of wife, two sons and two daughters out of the city to a secluded old mansion -- a fortress, a castle, as it were. In a confidence he shares only with his youngest son, he acquires stores, goods and foodstuffs, for the tough times he sees coming.