It was much more common than many people realise.
This is an incomplete list of officers from either Australia or New Zealand who died in 1914-16 whilst serving with British forces. I'm still working on getting together complete biographies on these men. And one woman (not in list).
Remember, these are just those who died in the first two years of the war, and does NOT include Gallipoli (which is a whole separate list I'm working on). So there would logically have been many more.
2nd Lieutenant Ian Calcutt FINDLAY, 2 Bn York & Lancaster Regiment, Died of wounds at 16th Field Abulance Advanced dressing Station, Belgium, on 10/8/1915, aged 18.
Major (Temp.) Arthur John Newman TREMEARNE, att. 8 Bn Seaforth Highlanders, Killed in action at Loos, France, on 25/9/1915, aged 38.
Lieutenant George Martin CHAPMAN, 2nd Dragoon Guards (Queen's Bays), Killed in action at Ypres, Belgium, on 13/5/1915, aged 28.
Captain Henry John Innes WALKER, Royal Warwickshire Regiment, Killed in action at St. Julien, Ypres, Belgium, on 25/4/1915, aged 25.
Captain James Fairbairn FAIRLEY, RAMC, Died of other causes in France, on 9/11/1915.
Captain Eric Louis GIBLIN, RAMC att. 24th London Territorials, Died at Loos, France, on 29/9/1914.
Captain Loftus Edward Perceval JONES, 7th Bn Yorkshire Regt., Killed in action at Voormezeele, Belgium, on 3/8/1915, aged 39.
2nd Lieutenant James Gordon MCKINLEY, Royal Garrison Artillery, attached 171st Company, Royal Engineers, Died of wounds at No. 10 Casualty Clearing Station, Ypres, Belgium, on 3/6/1915.
Captain Albert Guy MILLER, 12th Middlesex Regiment, Killed in action at Fricourt, France, on 29/12/1915, aged 31.
Brevet Major George Hebden RALEIGH, Royal Flying Corps, Killed in action at Dunkirk, France, on 20/1/1915.
Captain William Ulick Middleton (Macleay?) CAMPBELL, Highland Light Infantry, Killed in action at Neuve Chapelle, France, on 14/3/1915, aged 29.
Captain R R DICKSON, 14th Northamptonshire Regiment, Killed in action at Flanders, Belgium, on 9/5/1915.
Lieutenant W M CHISOLM, 1st East Lancashire Regiment, Died at Mons, France.
Captain George Arthur Murray DOCKER, 7th Royal Fusiliers, Died at Ypres, Belgium, on 17/11/1914, aged 37.
Lieutenant John Stanser RICH, 3 Bn., att. 1 Bn., King's (Liverpool Regiment), Killed in action at Richebourg, France, on 17/5/1915, aged 19.
2nd Lieutenant Thomas Graythwaite Burton DIBBS, 7 Bn, York & Lancaster Regiment, Died at Belgium, on 27/8/1915, aged 23.
Lieutenant Charles Montagu HARRIS, 7th Royal Scots Fusiliers, RAMC, Died in France, on 28/8/1915, aged 24.
Lieutenant Edward Guy MELLAND, 8th Bn. Cheshire Regiment, att. 1st West Yorkshire Regt. (Prince of Wales's Own), Killed in action at Ypres, Belgium, on 1/7/1915, aged 26.
Captain Robert Eddington GORDON, Northamptonshire Regiment, Killed in action in France, on 15/9/1914.
Major Frederick Nigel PARBURY, 20th Bty, Royal Field Artillery, Killed in action in France, on 10 5 1915.
2nd Lieutennat Sydney BURDEKIN, 10th Trench Mortar Battery, Royal Field Artillery, Killed in action in France, on 28/9/1915.
2nd Lieuteant H M DRAKE, 8th Battalion, King's Liverpool Regiment, Died of wounds in France, on 17/6/1915.
Sub-Lieutenant O STENHOUSE, Coldstream Guards, Killed in action in France [?]
Captain Herbert FLEMMING, 9th Bn., London Regt (Queen Victoria's Rifles, Died of wounds in England, on 7/5/1915, aged 33.
2nd Lieutenant Geoge Eric FAIRBAIRN, 10th Battalion, Durham Light Infantry, Died of wounds at No. 3 Casualty Clearing Station, France, on 20/6/1915, aged 27.
Captain Anthony Frederick WILDING, Armoured Car Division, Royal Marines, Killed in action in France, on 9/5/1915, aged 31.
2nd Lieutenant William Elric Hawthorne BIRCH, 6 Bn Duke of Cornwall's Light Infantry, Killed in action at Hooge, Belgium, on 31/7/1915, aged 23.
Lieutenant William Owen Nelson ROUT, 10th Highland Light Infantry, Killed in action in France, on 25/09/1915.
Lieutenant William Armstrong BURGES, 1st Battalion Royal Irish Rifles, Killed in action at Neuve Chappelle, on 10/03/1915.
2nd Lieutenant Ian Patrick CAMPBELL. Killed in action at Richebourg l'Avoue, France, on 9/5/1915
Major Charles Eric CLOUGH, 1st London Dvisional Coy., Army Service Corps, Died of other causes in France, on 12/05/1915.
Captain James Robert COOK, 21st Punjabis, Killed in action at Ypres, Belgium, on 26/04/1915.
Captain Harold Bickley Drewe HUGHES, 3rd Bn Warwickshires, Killed in action at La Bassée, France, on 16/05/1915.
2nd Lieutenant Sidney E PIERCE, King's Own Yorkshire Light Infantry, died aged 25.
Commander Joseph Armand SHUTER, Royal Navy, Died of other causes at London, on 16/09/1915.
Lieutenant Percival Wainman MCGRATH, Royal Naval Volunteer Reserve, 'Drake' Bn. Royal Naval Division, Died of wounds aged 42.
Captain Reginald Manning HERON, South Nigerian Forces (3 Battalion Cameron Highlanders), Died at London, England, March 1915.
Thank you very much for that. It's really interesting. Do you want any more names - I can give you that of my uncle, who is buried in France, having been killed by a shell on a mess tent, I think, and, as I mentioned earlier, was serving in the British army - or is this just a fraction of what you have and you don't need any more details?