I would agree with Atom on this showing two soldiers from the New Zealand Army (the big give away is the "lemon squeezer" hats that the girls are holding) from the 1st ww. They have bandoliers across their chests and a flaming grenade as a collar badge which would also signify to me to that they are from the artillery. The hat on the right shows a cap badge, is there any chance that just that part of the photograph can be made bigger so that we might see what it is?
old rowley