ɪn nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi tˈuː ðə bˈaʊndɚɹi ʌvðə ɹˈiːdʒən wʌz ɐdʒˈʌstᵻd wɛn pˈɑːɹt ʌvðə sˈɪɾi ʌv wˈɛstmɪnstɚ wʌz plˈeɪst ɪnðə nˈɔːɹθ ˈiːst tˈɛmz ɹˈiːdʒən.
In 1982 the boundary of the region was adjusted when part of the City of Westminster was placed in the North East Thames Region.