To be fair, its not standard in most markets - it's a separate package - (Spiegelpaket) at €175.00
VW UK, have (rather surprisingly) decided to equip UK GTI's and GTD's to a very high standard, so items such as, Xenon's, LED Rear Lights, 18" Alloys, Folding Mirrors, Adaptive Cruise Control, Auto Lights Wipers, Dual Zone Climate control etc., are all standard in the UK. However the downside to this is it's makes the VW one of the dearest hatches in it's segment (for the power). Certainly much more expensive than a Focus ST or a Megane for instance.
However some would argue (me included) that you are not only getting a better specced car for the money, but a better car full stop than any of the cheaper offerings.