1910s

Patrick MacGill (24 December 1889 – 22 November 1963) was an Irish journalist, poet and novelist, known as "The Navvy Poet" because he had worked as a navvy before he began writing.

Taken from his Wikipedia page.

en.m.wikipedia.org/wiki/Patrick_MacGill

Regarding his military service and work at the referenced MI7 (b)

MI7 (b) - foreign and domestic propaganda, including press releases concerning army matters.

A.A. Milne, author of Winnie the Pooh, was wounded at the Somme and also worked in MI7 (b) as did Lord Dunsany, a fantasy author and prolific writer, after the Easter Rising.

From the wiki article above -
"MacGill was born in Glenties, County Donegal. A statue in his honour is on the bridge where the main street crosses the river in Glenties. ..."
So off to Google Maps - maps.app.goo.gl/PN5nCb7U8CoTXHEi9

And of course it's here on Flickr, via CatMac Phtography

Mike Grimes Wow, had never heard of MI7.

Home of Lady Betty
www.askaboutireland.ie

Suck Diesel What a story!

[https://flic.kr/p/69hxkN]

Via Trove more tales of Lady Betty - trove.nla.gov.au
(1919)

Roscommon Messenger 22 June 1907

Madame Louise Grafton and her clever Dramatic and Comedy Company have provided excellent entertainment for well filled houses in the old Church during the past week. "Under Two Flags," "Not Guilty", "The Shadows of a Great City", "The Lady of Lyons", and "The Unknown", were amongst the pieces staged. The performances as a whole were successful, and the staging and general arrangements astonishingly complete. Madame Grafton goes to Castlerea next week where she is sure of a warm welcome.

I'm going to guess this was a copy, and that one of the soldiers is a relation of the Mrs. Gough who ordered it.

Calling beachcomber australia. Come in beachcomber australia. Try the catalogue now, please!

The Gambia Regiment is a possibility, per wikipedia:
The parade uniform of the regiment consisted of khaki drill shorts with red fezzes, along with scarlet zouave-style jackets. The jacket style was inherited from the West India Regiment. The jackets had a yellow edging and red cummerbunds. In the field, the regiment originally wore a variation of the Kilmarnock cap, but just prior to World War II this changed to the slouch hat. Similarly, British officers attached to the regiment initially wore pith helmets, but they also later changed to the slouch hat. Although most uniforms in the RWAFF were similar, the special distinction of the Gambia Regiment was a khaki and brown puggree, and a brown cummerbund.

Similar?

collection.nam.ac.uk/detail.php?acc=1977-09-130-6

Or the Northern Nigeria regiment, maybe