Hi.

Look BA in English is the under-graduate degree course of three years by the central universities. And english literature is vast set of epics, drama, plays, prose and poetry that let you peep into a particular genre or era of a century. In BA you are simply reading all prose and poetry, but in literature you have to read deeply about the English language origin, history and development. On the simple BA English base you can teach up to middle but with special English literature you can teach the PG students. And more important an honours degree in English literature is a specialised degree in that particular subject. It is more intensive and more subject focussed.

Hope it helps