Here are the rules: an unspecific catastrophe befalls the nation as you're on the way home from work, and for safety, you can only seek refuge in the countryside. You will have to stay there for the forseeable future. All you have with you are the things you would have as you travel home from work. The 'countryside' is a generic blend of British scenery combining woodlands, heath, moors, and mountainsides. You may forage, but cannot come into contact with any other people.