This is the great thing about this forum, there's always someone with some real knowledge of a subject. It certainly chimes with my experience of using the railways to say that we need more capacity, although a lot of that experience is on the suburban lines into London in rush hour, where it's hard to see how extra capacity can be created. Having said that, projects like Crossrail are helpful in that they postpone the day when the roads in London seize up altogether. You could build a new Underground line almost anywhere in London and it would fill up with people. People said 15 years ago that Croydon Tramlink would be a waste of money but it's a victim of its own success, frequently overcrowded.
While London needs more railways to enable it to get on with what it does best, generating money for the Treasury, the UK also needs the North to prosper doing what it does best, making things. The government (and opposition too it seems) appear to have reached the conclusion that HS2 is the best answer, and there certainly appears to be a need for more rail capacity along its route, but does that extra capacity really have to cost so much? I wonder whether a number of smaller ideas put together might be better value, for example:
If there are bottlenecks on existing lines going north out of London, would a bit of extra track or other minor works make it possible to run more trains?
Would longer trains be part of the answer? I think these have been introduced successfully on some commuter lines in recent years, making it possible for example to squeeze more passengers per hour through the bottleneck of the lines into London Bridge.
Why the emphasis on top speed, when the distances are not so great? Back in 1991-93 I used to commute out via Paddington to Reading, and it seemed that the train took many miles at each end getting up to top speed and slowing down again. And all too often it had to slow down in between due to some problem or other on the line. I suspect that money spent on signalling, track maintenance and line side security is unglamorous but effective?
Then of course there's the idea that business people should use Skype etc. more. The technology has its uses up to a point, but sometimes a face to face meeting really is best. Having said which, big organisations are very over-fond of holding unnecessary meetings. I've been in a lot of these where I've come out thinking "that was a boring hour I could have spent doing my real job".
I also wonder what infrastructure improvements businesses in the North think would most benefit them? Do they see better rail links to London as a priority, or are they more bothered about getting through trains to Ashford and Europe?