Minns is variously recorded as Horace or E Minns in the various journals and catalogues of the period. A record of his publications and brief biography is set out below:
1905 Bristol and Clifton 8th Arts and Crafts Exhibition: H Minns wins 3rd prize in the silver category, behind the Guild of Handicrafts (1st) and Gaskins (2nd).
1910 Arts Crafts Exhibition Society: H Minns is recorded in the 1910 Catalogue as executing work for Joseph Hodel.
1910: Living in Liverpool, marriage witnessed by Joseph Hodel.
1911 census: Living in London.
1912 Arts Crafts Exhibition Society: Recorded as executing work for Edward Spencer and the Artificers Guild.
1913 Studio Journal: Work by Minns for the Artificers Guild is illustrated.
1916 Studio Journal: Minns is recorded as executing a perfume bottle (see Van den Bosch Gallery) by the Artificers Guild, designed by Edward Spencer.
1916 Arts Crafts Exhibition Society: Minns is recorded as executing work for the metal working firm of Bainbridge & Reynolds.
1926 Arts Crafts Exhibition Society: Minns is recorded as executing work for the Artificers Guild.
See Christies sale 9th October 1992 lot 73 for a pendant in the style of Edward Spencer marked for Minns Howie. See Van den Bosch Gallery archive for an Edward Spencer designed peacock pendant marked for Minns