Okay, this is probably a mistake but the Sony Xperia XZ1 Compact is available for pre-order at 400 at Argos UK not 500 as Carphone Warehouse is charging. True, you dont get a pair of fancy headphones, but this is a killer price for the super mini. The large XZ1 is 600 as usual.
Again, this may be a wrong price from Argos. You can also see that the black model is listed as XZ1 (not Compact) even though it says 4.6 screen in the specs below (Source 2 link). That is to say that its not clear if Argos will honor this price if you hit pre-order.
We poked around some other British sites and they maintain the original pricing – 600 for the bigger XZ1 one, 500 for the small one.
Source 1 | Source 2