Two representative comments (not personal digs at the individuals concerned) show the very fine line Hornby (and all their competitors) walk. Not enough modern? - here's some modern. But now it's too modern! (and that is aside from the debate about how modern a train has to be to count it as 'modern'). You can't please all of the people all of the time.
My point was the combination of SWT and South Central slam door stock was an odd choice. From my memory, Connex Yellow was prevalent on slam door stock until their withdrawal in 2005, with South Central green being less common. A Connex Yellow unit would have tied in better with their previous 'Kent Coast' 4VEP and the class 466 models. (not to mention the Yellow Submarine Eurostar!)
As I said, hoping that now some 4VEPs are back, Hornby might reintroduce the NSE livered set next year if sales of the current models go well!