I was going to say, if you remember that the 128Ti comes with an 8 speed Auto as standard, bigger performance brakes (much bigger than the standard MK8 GTI units), the Torsen mechanical limited-slip differential form the M135i (tweaked), and the BMW Idrive system with the professional 10" screen as standard (the Discover Pro in the MK8 costs an additional - £1,600) etc.
If you configure a MK8 GTI in white with DSG, Discover Pro and Winter pack (as the BMW comes with heated seats as standard), the price is £36,830 vs the BMW 128Ti bog standard (similar or better spec) at the announced £32,995, then even before options, it seems the BMW (which is also more powerful) is already nearly £4k cheaper (at list prices)!