Going to throw in my suggestion here and say that, they may actually be 'Mounted Infantry Company' of the Welsh Regt and I'm saying this mainly because of the number of period photo's I have seen, where the 'slouch' hat is more often worn by the M.I..
In general the khaki F.S.H. was worn by the 'footslogger' and this would have included the V.S.Companies attached to regular Battalions.
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