1. 16th and 17th centuries: Emergence of RP, influenced by educated speech of London and Home Counties, associated with ruling class and educated elite
2. 18th and 19th centuries: Consolidation of London English/Southern English with rise of public schools, Classroom English/Educated English
3. Early 20th century: Educated Southern English/RP established as standard pronunciation model, variations based on style, age, social group
4. 1920s: BBC adopted RP for newsreaders, further establishing its association with prestige and authority
5. Last few decades: BBC and British media increasingly tolerant of accent diversity