I think adb968008's initial point, that Hornby should consider Augmented Reality (AR) as the more natural progression, shouldn't be forgotten/lost in the VR chat.
There is a commercial partnership, Hornby and Warner Bros, that is ideally suited to this and the age demographic - if an iPhone/iPad app that supplements these sets, and populates the physically built model railway and trains with augmented wizards and animated stories, is what it takes to get the next generation interested in model railways then I'm all for it (and I'll only demand about 5% of future profits for waiving my intellectual property rights on this particular idea)