Vulgar Latin
Kenneth Jackson argued for a form of British Vulgar Latin, distinctive from continental Vulgar Latin. In fact, he identified two forms of British Latin: a lower-class variety of the language not significantly different from Continental Vulgar Latin and a distinctive upper-class Vulgar Latin. This latter variety, Jackson believed, could be distinguished from Continental Vulgar Latin by 12 distinct criteria. In particular, he characterised it as a conservative, hypercorrect "school" Latin with a "sound-system [which] was very archaic by ordinary Continental standards".