DW
There were 3 different parts in BA colours at LGW in my time 1998-2001.
GB as you said as a BA franchise.
BA Longhaul
and European Operations Gatwick (EOG) which was a mix of ex DanAir 737-400s and BA 737-400s and latterly BA 737-300s. The easyJet network from LGW today reflects much of the EOG network then plus some.
BOAC
The fuel tables at EOG must have been introduced, in a de-identified form via pin Nos, around 2000.
I remember being very happy with my position at 55 out of 110 captains, neither too cautious nor too gung ho. The grey man favoured by RTI training!
1066