That particular aircraft F-WWDA was the second prototype. If I remember rightly, it had the BCAL colour scheme on one side and Air France on the other.
That particular aircraft was eventually delivered to Air France as F-GFKQ in February 1991 which was almost 4 years after it first flew.
The aircraft that was meant to be BCAL’s first aircraft was delivered on 31 March 1988 but BA didn’t merge with BCAL until 14 April 1988. The registration G-BRSA was allocated for it but wasn’t taken up. It was registered G-BUSB instead. Despite the gap between the delivery of this aircraft and the take-over of BCAL by BA, I don’t think that it ever flew in BCAL colours.
I hope this helps.
FC