The accuracy of the GPS signal depends upon a network of global ground relay stations that feeds the satellite signals back to Europe.
Guess what? That crucial network of global relay stations are all situated in British sovereign overseas territories.
Britain firmly has its hand on the weakest link of Galileo and could, should it so wish, set the entire project back by many years.
Why do we only hear one side of this argument, as though the Europeans held all the winning cards?