fˈaʊndᵻd ɪn tˈuː θˈaʊzənd, ðə tʃˈæɹɪɾəbəl wˈɜːk ʌv bˈɑːst ɪz bˈeɪst ɪn ɹˈɛd kɹˈɔs ɡˈɑːɹdən, lˈʌndənz fˈɜːst pˈɑːkɪt pˈɑːɹk ænd æn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd ˈeɪɾi sˈɛvən vɪktˈoːɹiən kɹiːˈeɪʃən ʌv ɑːktˈeɪviə hˈɪl, ðɪ ˈɪŋɡlɪʃ sˈoʊʃəl ɹᵻfˈoːɹmɚ ænd hˈɪl ˈɔːlsoʊ tʃˈæmpiənd pɹəvˈaɪdɪŋ ɡɹˈiːn ænd ˈoʊpən spˈeɪsᵻz tə pˈiːpəl, ænd hˈɛlpt tə sˈeɪv lˈʌndənz hˈæmpstɛd hˈiːθ ænd pˈɑːɹləmənt hˈɪl fˈiːldz fɹʌm bˌiːɪŋ bˈɪlt ˌɔn æz wˈɛl æz wʌz wˈʌn ʌvðə θɹˈiː fˈaʊndɚz ʌvðə nˈæʃənəl tɹˈʌst.
Founded in 2000, the charitable work of BOST is based in Red Cross Garden, London's first pocket park and an 1887 Victorian creation of Octavia Hill, the English social reformer and Hill also championed providing green and open spaces to people, and helped to save London's Hampstead Heath and Parliament Hill Fields from being built on as well as was one of the three founders of the National Trust.