ɹˈɑːbɚtsən wʌzɐ kˈɑːnstəbəl wɪð ɡlˈæzɡoʊ pəlˈiːs ænd ðɪ ˈoʊnli sˈɜːvɪŋ pəlˈiːs ˈɑːfɪsɚɹ ˈɛksᵻkjˌuːɾᵻd ɪn bɹˈɪtən ɪnðə twˈɛntiəθ sˈɛntʃɚɹi.
Robertson was a constable with Glasgow Police and the only serving police officer executed in Britain in the 20th century.