ITA does show flights for that Fare. Are you double-clicking the TAPUK9 Fare and using the [ITA Query Builder]?
OK.... I must be doing this wrong.
I'm running the query in KVS under Sabre on the fares tab
this returns the TAPUK9 fare
I'm then right clicking it and selecting "find flights using this fare ITA"
That opens a new "matrix search" window
I then fill that form out, inputting
depart = LHR
copy the fare code into the next box = LON :: /F BA.LON+DXB.TAPUK9
destination = DXB
fare code = DXB :: /F BA.LON+DXB.TAPUK9
outbound date = 9/21
return date 12/18
Adults = 1
Cheapest available
Hit search
No fares available every time.
I've mailed you a screenshot as well, just so you can see what I see
Thanks for all the help, I apologise for being useless!!