search me! .. but it was incorporated (B744) about 3 months ago, (or at least from being instructed to use V/S, we were then instructed to use VNAV, because RVSM considerations had been incorporated). I can't remember whether VNAV now gives a restricted vertical speed in the last 1000', or just that the TCAS now has a new programming which stops it panicking when it approaches an a/c at an adjacent FL at >1000fpm. Either way, VNAV is what we use now.
NB I'm not BA, but I would imagine all operators get the same updates.