A minor firmware update is rolling out to Xperia SP (C530X) users. No noticeable changes have been noticed in firmware version 12.0.A.1.257, it is likely to offer only minor changes and software optimisation. The firmware first started rolling out a few weeks back depending on region.
Meanwhile, we are still waiting for wide release of the handset in the UK. Some of the carriers such as T-Mobile and Orange have been shipping stock to people that pre-ordered and Carphone Warehouse also have availability. However, other retailers are still waiting including the official Sony Store and Amazon. Stock is expected next week, so we’ll update when availability widens.