I will be amazed if the UK GTD doesn't have the sound actuator - this isn't some new device - they're been routinely putting it onto the 170TDI VWs since 2009.
It does sound very good, but it's also clear when you have the windows open that the sound is completely fake. The Scirocco R has it fitted too so that it sounds different from the 210PS 2.0TSI unit.