I support the idea of improving rail infrastructure but my concern is they will go ahead with the London to Birmingham part, it will be way over budget so the rest of it will be postponed. Meanwhile London will keep growing, and before we get round to building the rest of HS2/3/4 etc, the next big transport project for London will take priority because of the ever increasing demand there.
They should start with the Birmingham to Manchester to Leeds part, and then maybe onto Edinburgh or Glasgow before bothering with London. Make it more appealing for people and businesses to move north.