Chance of safety - Henrietta Branford

A sinister government rules Britain with a rod of iron. Society is split into the haves and have-nots. Alex and Nelly are fortunate - they were born into a Grade A family, and know nothing of life in Grade B.

But then their father discovers that toxic wastes are leaking into the Grade B water table - with lethal results. When he starts to investigate, the entire family is put in danger. As they flee anonymous threats of violence, the children's parents are arrested. Too scared to reveal themselves to the authorities, Alex and Nelly take to the forest, where they must learn how to survive on their own. If they can just make it to their Grandmother's house, surely everything will be all right . . .