Degree in Linguistics

I have scoured the internet for universities that provide a degree in linguistics, but I could not find one that offers part-time courses. Further, I am not sure which universities are good when it comes to this discipline. My second problem is, I am not sure whether to do a bachelor's degree or a master's. (By the bye, I have two degrees: one of them is a degree in English from a university in London).

Could someone help me?