Hello, looking at the buffers, where the shank meets the buffer beam bar there's a big difference between model and real loco. The model shown as pre-production has the buffers just plonked in place. Looking at other photos on the web the shanks are recessed into the running plate (sorry if that's not the correct description). I've zoomed into a photo from Wikipedia, owned by Peter Skuce
https://commons.wikimedia.org/wiki/File:British_Railways_Class_A1X_Terrier_32678_Tenterden_Town.jpg where he has given permission for the photo to be shared / modified as long as he's credited.
I know there will have been modifications to the real locos over the years, but the model looks odd, certainly differs from the photos on Andy's posts on page 1.
Amand.