The 1.4 is a naturally aspirated (so it sucks), has 20 horsepower less and is down 43 newtons on torque. Despite this, the 1.4 has a much higer CO2 output, 139g vs 124g. It's an old lump and far worse than the new 1.2 in every single way. Except it's cheaper, and on offer.
I have a feeling that VW is waiting to introduce the 1.2 here (and other markets with a 120g/km cap) until they have shaved off those four grams. Customers like tax free cars. The option is the 1.6 TDI but they don't offer the most powerful version of that with the DSG so it's still down on power compared to the 1.2 and more importantly, it's quite expensive.