ɔːlðˈoʊ ðɪ ˈɪnstɹəmənt ʌv ɐpˈɔɪntmənt kˈʌvɚz bˈoʊθ ðə nˈɔːɹðɚn ænd sˈʌðɚn ˈɛɹiəz, fɔːɹ ˌɑːpɚɹˈeɪʃənəl pˈɜːpəsᵻz ˌɛndˌʌbəljˌuːˈɛl tɹˈiːts ðˌɛm æz sˈɛpɹət tɹˈeɪdɪŋ dᵻvˈɪʒənz, nɔːɹθˈʌmbɹiən wˈɔːɾɚ ænd ˈɛsɪks ænd sˈʌfək wˈɔːɾɚ.
Although the Instrument of Appointment covers both the northern and southern areas, for operational purposes NWL treats them as separate trading divisions, Northumbrian Water and Essex & Suffolk Water.