The Liturgical Advisory Committee (LAC) of the Church of Ireland has published a set of liturgical resources for use in parishes marking the death of Her Majesty, Queen Elizabeth II and the Accession of King Charles III.
The resources include material for the preparation of a Service of the Word or a Service of Holy Communion. There are also prayers and suggested readings that can be used in the context of Morning and Evening Prayer and other offices.
The resources can be downloaded from this link