Legal discourse is widely assumed to be resistant to change, and indeed legislative documents are extremely conservative with fixed and formulaic structures. However, recent research has shown that changes can be observed in the lexico-grammatical features of some legal documents when examined diachronically, particularly since the emergence in the 1970s of the Plain Language Movement, which sought to draw attention to the unnecessary complexity of the official language, this including legal discourse. Despite the crucial changes in legal language in recent years, research in that direction is scarce to date, particularly in the British English variety, probably due, in part, to the shortage of specialised corpora that allow this kind of studies. In order to bridge this gap, we have embarked on the compilation of the