Originally Posted by
mmxbreaks
Ditto.
It tends to only offer it upon check-in, however. I was once told this had something to do with the airline being able to define the price structure from that point...
It's certainly not always available on TA bookings, however, and I'm sure the fare bucket is an important factor too.
I can see why for travel agent booking it appears only at check in time (ie when BA have control of the booking) but I'm fairly sure it's not fare bucket related (at least availability isn't, maybe erroring bookings are) - today's specific instance was a Q class fare for instance (lowest economy, 5TP) and after a phone call it went through no problem...