Here is a list of easy-reading books in the DWC library related to Britain and British history. I’ve included a lot of fiction here, too, because it often gives a good picture of life in a particular period, e.g. the stories of Dickens or Conan Doyle or Jane Austen.
There are often several books with the same title listed. That is because they have been re-written to different levels of difficulty. Find the book that is the right level for you by reading a page or two and seeing if you can understand 90% without a dictionary. If you can, then this is probably the right level for you.
Here’s the list: AS1_Easy_reading_library_list