Ambassador, British Airways; FlyerTalk Posting Legend
Join Date: Apr 2012
Location: Leeds, UK
Programs: BA GGL/CCR, GfL, HH Diamond
Posts: 42,966
When did you apply the GUF exactly? Did they say anything when you called to apply?
My own thoughts would be any change to these bookings beyond the end of the promotion booking window, including GUFs or UuA, does lead to a recalculation of taxes/fees/charges and avios. So I would have expected extra avios to be charged if you apply a GUF now. However, if you manage to get it credited back that would be a good result.