This document summarizes the major phonological changes that occurred between Old English and Middle English, focusing on the changes that occurred in the London dialect. It describes changes in consonants such as the simplification of clusters and loss of final n. It outlines vowel changes like unrounding of y and diphthongization. It also discusses processes like lengthening and shortening of vowels, leveling of unstressed vowels, and loss of final schwa. The London dialect incorporated influences from Northern and Southern dialects and eventually became the standardized form of Modern English.