We love this App from ViewRanger.
ViewRanger is a complete offline mapping, navigation & guided trail service. The app & free web tools will help you plan every stage of your outdoor adventure. It has the ability to record your walks to share with the community, or to follow paths already taken by others.
It can be accessed on your computer before you make your trip to the Lake District, or download it and use it on your phone or tablet. Try it on these interactive maps or visit the ViewRanger website here.