Dont Know but there are a few Scottish horse Sites that may yield service records. From my reading of the Scottish horse regiments Australians joining paid their own way to Jo'burg to join. The Scottish Horse Regiment was a private regiment and has quite a history. An off shoot of the Scottish horse was the 5th Battalion a Australian Scottish battalion that was formed in WW1 and again in WW2. As a national serviceman I was drafted into 5th Battalion in Vietnam. So my battalion that i joined as links back to 1901 to my Grandfather's Regiment some 70 years later. There is quite a bit of info if you google 1st Scottish Horse.