...after one of BA's planes has been repainted in the Negus retro livery, do you think that there will be a British Airways Boeing 777-200ER repainted in the old BEA peony/three-crown livery? Here's proof that such a BEA livery existed:
look for the section that has images of a livery with at least one white crown in this link.
Similar to the case with G-EUPJ when it was painted in an old BEA livery, the wings will need to be a predominantly-gray color if a BA B777-200ER ever gets repainted in another old BEA livery,
-Emily