As requested above, here are a couple of line-up pictures of my four new Bachmann Class 47s to allow a comparison of liveries. I think Bachmann have done a good job of capturing the colours.
I have also included some pictures of comparisons with similar liveries on locos from other companies. The Hornby GW150 Class 50 compares well with the Bachmann GW150 Class 47. The HST InterCity livery and the Heljan RES livery are quite different from the Bachmann equivalents. Of course, it's InterCity Executive vs Swallow and RES vs Parcels, but I assume the main colours of comparison (creamy/brown on IC and red on RES/Parcels) were the same???