The aircraft you flew on would be
G-UKTM. She was on lease to British Regional Airlines (a BA franchise partner) from November 1999 through January 2002 and operated in the BA colors during that period. She has not been repainted since her return to service with KLMuk and hence continues to operate in full BA colors, but with all "BRITISH AIRWAYS" titles removed and an "operated by KLMuk" sticker forward of the entrance door (as pictured in the link).
[This message has been edited by B747-437B (edited 06-12-2002).]