I definitely would not call it a mutt language, because mutts are just wild mixtures. Have you seen south asian street mutts? England was invaded in quick succesion by various Aryans, starting in the Bronze Age where the original male population was almost 90% replaced. The next big wave were the Romans who made more of a cultural impact. Then various Germanics (Angels, Saxons, Vikings, Normans). An Englishman should be proud of an early history which revolves around a lot of brave warriors.