Hello Patty,
Evans, an 18 year old grocer, joined the 11th Hussars on the 28th of June 1889 at Birmingham and after service in South Africa and India, he transferred to the Army Reserve on the 17th of February 1897.
Like so many, he was recalled to the colours for the Anglo Boer War on the 20th of December 1899, he was posted on the 18th of January 1900 and served in South Africa with the 6th Dragoon Guards, he was discharged from the Army on the 27th of June 1902.
His father was George Evans, his mother, Ann Evans, he certainly appears to have been born in Forden Montgomeryshire and was baptised on the 1st of December 1872.
Interestingly his service in the Great War was with the 1st South African Infantry in France, in addition to his papers in WO374 he also has an entry in WO372 here, 1st SAI were part of the famous SA Brigade and had fought the vicious and very bloody defence of Delville Wood just a few weeks before he was wounded, his medal cards will be available to you in Pretoria along with his original attestation and casualty card etc, whilst there is a small copy of a medical report here in Great Britain, I would fully expect a far more complete file is extant in Pretoria.
Anyway, I wish you bon chance with your research,
Regards Frank Kelley
Patty Pedlar wrote: Thank you both for your prompt answers - what exactly is QSA ? would every soldier serving in South Africa have received such a medal ? - and do you think he would have been discharged in South Africa or would he have had to return to UK with his unit and then return later to South Africa. I did warn you I was a novice 
I hope one day to visit UK and will plan a visit to Kew to do some research.
I will keep delving but if anyone else can add info that would be great.