As others have said, HS2 would most likely have been completed in full had they started construction in the north and worked their way down.
Saw a news prog the other night with extracts from some report into HS2, some of the findings beggar belief. Talk about planned on the back of a fag packet.
Although there's always a valid debate around 'cut your losses', I wonder how much has been spent on the bits that will never be built. Not just referring to construction, I'm referring to everything related to the project.
China, HSR 2007
Spain, AVE 1992
France, TGV 1981
Japan, Bullet train 1964
UK, HS2 ... well part of it hopefully ... 2029 - 2033?
Mind you as I said before, we've no room to talk in Scotland. We can't even get 2 x new ferries out on time or budget!