ðə səspˈɪʃənz ʌv ˌɛmˈaɪ fˈaɪv ðæt ˈɑːɹkoʊz wʌz ˈæktɪŋ æz ɐ kˈʌvɚɹ ˌɔːɹɡɐnəzˈeɪʃən fɔːɹ ˈɛspɪənˌɑːʒ æktˈɪvᵻɾi wɜː fˈɜːst ɚɹˈaʊzd ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈaɪv wɛn dʒˈɑːn ˈɑːɾəwˌeɪ hæd tˈeɪld ɐ sˈʌspɛkt bˈæk tə ðə mˈʊɹɡeɪt ˈɑːfɪsᵻz.
The suspicions of MI5 that Arcos was acting as a cover organisation for espionage activity were first aroused in 1925 when John Ottaway had tailed a suspect back to the Moorgate offices.