Speaking as someone who has the whole fleet. They could be better. The model is over 10 years old and the bar keeps rising. There are the lourves which are too deep,. The face of the loco is wrong. The headcone is not a good representation as the lights are too deep and the main roof grille is undersize. They are not a bad model but no where near as good as the Hornby 60, the SLW 24, the Dapol 68, many Bachmann offerings and presumably the Accurascale Deltic when it arrives. They are a 7 or 8 out of 10 model.
I can definitely see someone else doing one and the 31 while they are at it unless Hornby redo it themselves.