Language discourses
The excellent MacMillan Dictionary blog has a great post on it about the role of dictionaries in debates about language change. For any A2 students starting to look at ENGA3 Language Discourses it's a must read, so have a look here. And in the article Michael Rundell makes reference to a recent classic: Jean Aitchison's Reith Lecture on language change, which you can find here.