Here's my only example of a single clasp KSA but it has an interesting history.
Many years ago I picked up the QSA to 5219 Pte. T. Frost West Yorkshire Regiment who was wounded at Willow Grange 23/11/1899. Such documentation as I could find showed that at some point during his service he changed his name to Bridges.
Years later while idling through the DNW catalogue the night before the auction, having already place my bids, my eyes nearly popped out my head when I saw his KSA and 1914-15 trio in the name of Bridges (all West Yorkshire Regiment) which I'd originally overlooked. The KSA is named to 5219 Sjt. T.F. Bridges the 1914-15 Star to 3-8943 Sjt. T.F. Bridges and the pair to 2/Lieut. T.F. Bridges. He was wounded at Gallipoli 13/8/1915.
Judging by more documentation that came with them the previous owner had clearly been baffled as to the absence of Bridges from the QSA roll and I was happy to secure the medals for relative peanuts with the broken group clearly not having a wide appeal.
Bridges is one of those men who qualified for the KSA with single clasp 1902 despite not serving 18 months in South Africa. As he was invalided home as a result of being wounded in action his time convalescing in the UK counted towards the 18 months before he returned to South Africa in early 1902.
Thomas Frost Bridges came from Sheffield and was a humble labourer. In his commission reference in 1917 his CO wrote "He has served with the Battalion since it was raised, being absent in England on account of a wound received in action. He is a man of long experience, an energetic and conscientious worker. Altogether a reliable man." He was further promoted to Lieutenant in 1919 before being demobilised in 1920.
David