Todd wrote: “Even more ironic is the fact that the coal-scuttles were made by Vickers!”

Yes, that also was not lost on me. I kept thinking about the Vickers machine guns (First World War manufacture) that we still used in the 1960s and ’70s.
I have never fired one, but I was in a support weapons company, which included a Vickers platoon.
And the terminology glengarry for a caubeen strikes me as extraordinarily odd, especially since the cavalry might have been expected to wear helmets with visors! (Thinking of the lugs which were never used in Ireland for the attachment of visors.)
Regards,
Mike