Actually they're the ex Cityflyer Express RJ100's which came to BHX when BA purchased BRAL & merged it with Brymon to form BA Citiexpress. BRAL also had a handful of 146's, but these never operated out if BHX.
Oh were they now, well they were so bl@@dy slow through the Daventry CTA I always assumed they were the 146.
RJ100/BAe146 what is the difference, do we agree that they are not BA mainline.