UK generic or UK SIM free phones have been last to get the firmware updates for a while. It also happened with the Xperia Z.
If as has been stated, the UK generic firmware is only being approved after all the UK networks have approved their bloatware version (which are all based on the UK generic firmware) it seems clear that Sony UK are not actually testing the firmware themselves. They are waiting for everyone else to give the all clear and then releasing it.
If Sony had a decent firmware beta programme like the fruit based company who shall not be mentioned, we wouldn't be subject to this crappy process. The current process (crappy) is fundamentally flawed. It's apparent that some networks do little or no testing. If they did, they would not have approved the .136 firmware as it's got some fairly annoying bugs in it. This early (careless) release is possibly done to ingratiate themselves to their customers who annoy the **bleep** out of customer services asking about the release date (nobody ever gives it).
A long and drawn out process involving very few people is not the way to go. Release a beta to a few thousand people and you will have your bug list in days rather than weeks or even months.
Improve the process even further by releasing a unified firmware and stop pandering to phone networks who want to add annoying bloatware that nobody wants in the first place.
