Unlikely to an Officer Ryan - the rank and file have papers - on this site until alphabet letter "B" if I am not mistaken - the rest via a researcher at Kew - I use Kevin Asplin - he's fast and reasonable.
There are no papers for direct entry commissions into the SAMIF, if he served within the rank and file beforehand, extant papers are in WO126 at Kew, depending upon the particular regiment concerned, if he subsequently served within the Transvaal Volunteer Force, I would consult the Light Horse Regiment archive in Johannesburg.
If you know or believe that he served within the ranks of the British Army or Militia, a careful look throughout WO96, WO97, WO363 and WO364 at recipients with his name would be the way to go.
rdarby wrote: Does anyone know if anything is available for the ILH?
I’m trying to find attestation papers or anything for Captain W Jardine.
Not much help, but "War Services of Officers of Colonial Forces" - under Cape of Good Hope - shows "Jardine, W . S.African war, 1899-1900 - operations in Cape Colony and in the Orange Free State. Queen's medal with two clasps". Elsewhere, under the heading "Lists of Officers of certain Colonial Regiments and Contingents serving under the GO CinC" shows W.Jardine under the heading "1st Imperial Light Horse" as Lieutenant and with crossed swords in front of his name. Which latter apparently means he saw action. The latter List referred to above was corrected from returns forwarded from S.A. in November 1901 except where otherwise stated. So your man saw service at least until 11/01.
Good luck with your research.