England is a foreign country as far as I'm concerned but seeing as how they will be using my money to pay for this I might as well have a say.
1/ They're years, actually decades behind other countries with their rail system, it's point and laugh stuff so they better get the damn thing built.
2/ They'll make a complete shambles of it, making sure all the public school t'wats make a fortune from the public purse.
They'll never bother building it north of Birmingham.
In summary, Yes it should be done but not as a vanity project and not until they upgrade the rest of the system.
Spend the money on something we really need , like a fantasy bridge between Scotland and Northern Ireland.