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The guidance notes for the Holy Communion service deprecate the inclusion of Gloria in Excelsis in Advent:
11 The Gloria in Excelsis
This canticle may be omitted during Advent and Lent, and on weekdays which are not Principal Holy Days or Festivals.
29 The Gloria in Excelsis
If the Gloria in excelsis is not to be used on every occasion, it is appropriately omitted on Sundays in Advent and Lent and on all weekdays that are not Principal Holy Days or Festivals.