All great responses everybody. I went with this as requested by Brian in the end:
xinstance2 = InStr(xinstance1 + 1, iUPC, "/")
xinstance3 = InStr(xinstance2 + 1, iUPC, "/")
xinstance4 = InStr(xinstance3 + 1, iUPC, "/")
So simple, yet i couldn't think of it yesterday!
Thankyou all.
Elliott