First of all, I do understand Hornby's desire for secrecy when announcing new products. Going back a few years, they planned to do the 4-CEP, but news of this got to Bachmann via a Hornby employee (very soon thereafter, I understand, to be an ex-Hornby employee), and the ever-combative Graham Hubbard quickly re-arranged that particular bit of history, despite Bachmann development and production periods every bit as long, if not longer, than Hornby at that time. (Hubbard also upstaged Kohler over the Hall, leaving Hornby with its excellent but less popular Grange.) The upshot was that Simon Kohler, still wanting to do an 'express' EMU, did the VEP. Kohler's fixation with fanciful express stock and large locos continues unabated, hence the 5-BEL. It was the wrong move in my opinion. The smart move, even then, would have been to have gone for the 2-BIL straight away (it consistently rated highly in the polls). Had that happened, we wouldn't be in the situation we are in now, and we would have had a 2-BIL at a higher spec, and probably cheaper too. In that light, the 2-BIL has not been rushed out too quickly, because it was already five years too late.
Clearly, the 2-BIL had been in development for some considerable time before its public announcement in December 2012. The downside of Hornby's secrecy is that they seem happy not to consult anyone, and obvious and elementary mistakes can slip through. Chief amongst these is that Hornby assumed the prototype had two drive bogies. If they'd only asked...