gingerdad ... so you think businesses all points north of the Watford Gap will find it fixed costs cheaper to move down to London just because of a 'few minutes off a journey', rather than the other way around, why is that?
The same for London workers, who for quality of life, could move further out if the journey was easier.
If the country didn't need better/more capacity already, never mind as our population grew, I'd agree just building just for speed is highly debatable.
Political Partys say they want to 'invest' (mainly by borrowing) infrastructure, they don't want airport capacity which for some main hub airports has not changed in several decades, or now HS trains - and no doubt refuse to build homes on the greenbelt we really need - what do they want to 'invest in, more public sector workers/quangos to please the trade union bosses supporting them?