ðɪ ˈɑːptɪməm pˌɑːpjʊlˈeɪʃən tɹˈʌst hæd kˈɔːld fɔːɹ nuːmˈɛɹɪkli bˈælənst ɔːɹ "zˈiəɹoʊnˈɛt" maɪɡɹˈeɪʃən tə ðə jˌuːkˈeɪ, bˌʌt dɪdnˌɑːt kəntˈɪnjuː tə səpˈoːɹt ðɪs pˈɑːlɪsi æz pˌɑːpjʊlˈeɪʃən mˈæɾɚz.
The Optimum Population Trust had called for numerically balanced or "zero-net" migration to the UK, but did not continue to support this policy as Population Matters.