ɪts ˈɪmpækt wʌz sˈʌtʃ ðætðə mˈeɪɚɹ ʌv lˈʌndən ænd mˈɛni ˈʌðɚ kˈaʊnsəlz ˈɔːlsoʊ ˈɪmplɪməntᵻd ɪt; ænd ɪt bɪkˌeɪm pˈɑːɹt ʌv nˈæʃənəl plˈænɪŋ ɡˈaɪdəns.
Its impact was such that the Mayor of London and many other councils also implemented it; and it became part of national planning guidance.