English literature; English-language literature
Refers broadly to literature written in English, not limited to England. In academic contexts, it often includes American, Canadian, and other Anglophone literatures.
She is majoring in English literature at university.
British literature
Specifically literature of the United Kingdom. In some contexts, 英文学 may be used to distinguish British literature from American literature (米文学).
In this class, we study British literature, focusing on Shakespeare.
I'm majoring in English literature at university.
She studied English literature at a university in Britain.
He belongs to the English literature department.