These time scales are denoted in the form UTC(NPL) in the UTC form, where NPL here identifies the National Physical Laboratory, UK.
ðiːz tˈaɪm skˈeɪlz ɑːɹ dᵻnˈoʊɾᵻd ɪnðə fˈɔːɹm jˌuːtˌiːsˈiː ˌɛnpˌiːˈɛl ɪnðə jˌuːtˌiːsˈiː fˈɔːɹm, wˌɛɹ ˌɛnpˌiːˈɛl hˈɪɹ aɪdˈɛntᵻfˌaɪz ðə nˈæʃənəl fˈɪzɪkəl lˈæbɹətˌɔːɹi, jˌuːkˈeɪ.