Famous English epics include the Old English poem Beowulf, and, in the Renaissance, Spenser's Faerie Queene and Milton's Paradise Lost.
Don't use the term epic loosely for anything large in scope. Although networks will try to convince you every miniseries and telemovie is "epic," don't believe 'em -- or, at least, don't use that sort of advertising cant in an English class.
Note: This guide is still in the early stages of development. Bear with me.