L'operazione includeva anche le responsabilità degli annunci ufficiali nei vari paesi del Commonwealth. In Australia, ad esempio, la responsabilità di informare il governo ed il pubblico venne delegata al governatore generale [[David Hurley]].<ref name="magnay">{{Cite web|title=Prince Philip: A loyal prince devoted to his queen, dead at 99 |last1=Magnay |first1=Jacqueline |url=https://www.theaustralian.com.au/world/prince-philip-dies-aged-99/news-story/219d07ee3935034e869be42729f2709e |access-date=9 April 2021 |website=The Australian}}</ref>
Le bandiere governative vennero poste a mezz'asta anche su tutti gli edifici pubblici nel Commonwealth. Per protocollo, la bandiera nazionale australiana venne tenuta a mezz'asta il 10 aprile ed il 17 aprile, in segno di lutto e rispetto nei confronti del duca.<ref>{{Cite web|title=His Royal Highness the Duke of Edinburgh: Australian National Flag to fly at Half-Mast |url=https://www.pmc.gov.au/government/australian-national-flag/flag-network/his-royal-highness-duke-edinburgh|date=9 April 2021|access-date=9 April 2021 |website=www.pmc.gov.au}}</ref><ref>{{cite web|url=https://www.pmc.gov.au/government/australian-national-flag/flag-network/his-royal-highness-duke-edinburgh-1921-%E2%80%93-2021|title=His Royal Highness The Duke of Edinburgh|website=www.pmc.gov.au|date=13 April 2021|access-date=17 April 2021}}</ref> In Canada, l'abbassamento delle bandiere avvenne il 9 aprile e tale rimasero sino al tramonto del 17 aprile.<ref>{{Cite web|last1=Heritage |first1=Canadian |date=3 May 2018 |title=National Flag of Canada half-masting notices |url=https://www.canada.ca/en/canadian-heritage/services/half-masting-notices.html |access-date=9 April 2021 |website=aem}}</ref> In Nuova Zelanda, il primo ministro [[Jacinda Ardern]] diede l'annuncio ufficiale.<ref name="auto1">{{cite web|date=10 April 2021 |title=World leaders react to news of Duke of Edinburgh's death |url=https://www.rnz.co.nz/news/world/440174/world-leaders-react-to-news-of-duke-of-edinburgh-s-death |access-date=9 April 2021 |website=RNZ}}</ref><ref name="auto2">{{Cite web|title=The Duke of Edinburgh |url=http://www.beehive.govt.nz/release/duke-edinburgh |access-date=9 April 2021 |website=The Beehive}}</ref><ref>{{cite web|url=https://mch.govt.nz/nz-identity-heritage/flags/half-masting-new-zealand-flag-occasions|title=Half-masting the New Zealand Flag occasions|publisher=New Zealand Government|date=12 April 2021|access-date=15 April 2021|website=mch.govt.nz}}</ref>
