Many thanks for the tip, djb. I'm sure there is a family connection because the same(?) Capt. H.F. Lardner-Burke MC is listed in the Supplement to the London Gazette of 22 Aug. 1918, as follows:
7th INFANTRY (KIMBERLEY REGIMENT)
Harris, Lt.·Col. H. S. Lardner-Burke, Capt. H. F., M.C.
Ormiston, Capt. T.
Williams, Capt. G. W.
Duncan, L.3729 Pte. H. D.
Hawkey, L5085 C.S.M., J.
Smith, L.4077 Pte. F. P.
Trembath, L.5083 C.S.M., J. R.