Originally Posted by
heartybob
Doesn't a GUF2 simply upgrade an already existing or a new cash or avios booking, so your booking should already be paid, either in cash or avios, before the GUF2 can be applied?
A GUF can be applied at the time of booking or at a later date to an existing booking if the booking was made directly with BA.
For a TA booking the GUF is applied at the time of booking. Basically the TA notes the GUF on the fare quote and then sends it to BA to ticket - more information on the trade support page here
https://www.britishairways.com/en-gb...d-card-upgrade