"HS2 is looking um, a bigger white elephant"
Both HS2 and a UK Brexit Galileo are just enormous and pointless huge wastes of taxpayers' money which could be spent on better things.
Instead of HS2, what's needed is more electrification and more First Great Western new super fast Intercity Express Trains at a fraction of the cost. As for the global positioning issue, all that requires is a pragmatic agreement to use either the existing EU or US systems.