From the Introduction:
England is Dead is a roleplaying game set in an alternate England of the late 17th Century. In this setting the bubonic plague wiped out 95% of the population, leaving isolated pockets of civilisation scattered around the country. The players will travel the desolate land, discovering what humanity remains, and ensuring it is of the standard that England expects.
Think of the setting as a dark English 17th Century post-apocalypse. The group should decide on a tone before they play. England is Dead can be played as a grim look at a fallen society, a perilous adventure, or a story of dark horror.
To play you need a Games Master (GM), some players, pencils & paper and a few D6 per player.