Mike,
10 Bn comprised 37 and 38 (Bucks), 39 (Berks) and 40 (Oxfordshire) Companies
Berkshire, Buckinghamshire and Oxfordshire Yeomanry medals are all fairly sought after, so you can expect to pay £120 to £180 for a Queens South Africa medal and if the person were an officer or wounded killed then maybe double or more...
· Trooper 8008 IY by Sidney Peel 40 Coy 10th Battalion - first contingent Bucks IY
With Lord Methuen in South Africa by February 1900 to June 1901 BY H. S..GASKELL, M.B., CK.B.- 38 Coy 10th Battalion Bucks IY
There are 120 men in each Company and two contingents. If you get the Casualty book then you can identify all casualties in the contingent and places. Which gives a pretty good idea of where the Company was at different dates.
Wayne