it would be best if we could see the card, at present we only have want you
think you see

BW & V is british war and victory medals
Comm'y is probably commissioned (should be a date there)
"M.C." is obviously military cross
i suspect he was commissioned from the Northants Reg't., into the K.O.Y.L.I.
K.O.Y.L.I. OFF/114 Page: 206D this is the actual page in the koyli medal roll, officers section where there should be more details
i.v.B/3921 d/28-11-27 i suspect this is a kings regulation number, possibly when he was sent (re-sent) his medals ( but i'm guessing without the card)
this will not tell you where he fought, you need to know which battalions of the regiments he was with
chris