Re: "not economically feasible"
It will also free up capacity on the existing lines making for a far nicer experience on them.
That's the joke or lie!
HS2 isn't due to be around until 2034 at the earliest, however, Network Rail et al are already taking decisions, such as implementing new timetables in 2018 that reduce capacity on the existing London-Birmingham and London-Nottingham lines...
Additionally, where I live, it is currently under 1 hour into London, under the new timetable, the new 'fast' service will take 1 hour 15 minutes! Naturally, the price will also be increased.