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