There are many resources available to help you with British Literature. The most useful source is The British Library. They have a copy of every book, poem, play and other published material from Beowulf on. They have a variety of articles and artifacts for you to explore.
British authors have flooded our bookselves with timely classics and contemporary novels. Here are the 100 Best British Books collected through a poll by the BBC.
The history, literature and royalty of Britain are very closely linked. It is helpful to understand a bit about the history to understand the literature. It also helps to understand the relationship of the monarch to the people.