I understand what you mean TB, but travelling to Europe is so easy now for us in the South. Forget busy overcrowded airports and high seas in the Channel.
Assuming I would ever use Eurotunnel services again (I won't, lying breakless retards), remind me how HS2 (Phase 1, Phase 2 will never get built) will improve my trip? It will only improve your trip *IF* you are within a few minutes of the 2 Birmingham termini. And on such a journey, are you going to pay the premium to shave around 15 mins off your journey? Personally, I'd get one of the slower, far cheaper coaches that drop you right off outside Kings Cross, and not have to worry about trying to drag my cases across the underground. It would probably be quicker anyway

HS2 is not a route to Europe. HS2 Ltd say its primarily a commuter service in to London.
As for HS2 use; eventually it will extend to the north and it will be of great benefit for those travelling to European destinations. Going from Birmingham to London? well no, I would never think that will form the major element of passenger travel. You are right. But the line is destined for European travel firstly, but secondly it will be also used for internal British travel. Already we have the Javelin service to St. Pancras on the HS1, and a considerable amount of business passengers are using that to get up to London quickly, then back down to Ashford, and south coast towns such as Folkestone. Yes they pay a premium, but I have heard the argument it is far better to pay the extra for the speed, and be able to spend more time with the family, per day, per week, per month............you get the picture. 
HS1 is a commercial failure I believe?
HS2 will not extend to Europe. Its purely a Birmingham to London service. I'm going blue in the face saying it.
Even HS2 Ltd say its unlikely that Phase 2 of HS2 (Mancs and Leeds) will ever get built. I think they can see the journey improvement times are not enough to warrant it, as there is little scope to improve it much. All the time benefits are at the London end.