Hornby's attempt is certainly an ornate piece of moulding. However I notice the following -
The wheelsets are of the same unsubstantial style which spoil Tornado and the 75XXX.
The rear bufferbeam should be red, not black.
The chimney is poor, and not for the first time from the big H.
The valve gear is slightly superior to Bachmann's in that it has more detail (the funny rod thing behind the cylinders?).
Cab interior detail is present and inclusion of cab doors, as is usual for a modern Hornby kettle.
Flaman speedo bracket included, although I don't believe all the locos had them.
The paint finish looks about on a par with Bachmann's 61180.
In summary, very nice but I think I'll be sticking with the Bachmann version for my MPD layout, good enough for me and once you've bought 4 or 5 a fair saving over the big H.