Interestingly, A30 in original silver seems to be the least popular with 65 left as I type this. I've seen one of these in person and they look stunning, I think definitely the most eye-catching livery so am surprised that this loco is the least popular even though A1 is almost sold out - the Special Edition factor probably explains that though. Also interesting is that dark green A46 was very popular yet light green A42 is not.
Also - for some reason the very helpful customer reviews are only available on the .com version of the website and not on the .co.uk version?