I still believe that the Lima Class 31 is the best looking model of a 31. Even the old motors do not bother me too much, with careful cleaning and Ultrascale wheels the running can be good after running in. I also fit extra pick-ups to the trailing bogie. The only thing that suffers is the pulling power. I guess a new model Hornby chassis with a Lima body would be almost right. Of course all moulded handrails need to be removed and replaced with brass ones. All of the blue ones on this post also have added LED lights and are weathered.
I have to say that the plastic, fit yourself, cab handrails really need replacing with brass ones, sadly I had neither the time or inclination to do it. The four loco’s below are what I have left of my Blue 31’s, many have been sold. I originally had most variances covered.