Samsung Mobile U.K. has issued a statement saying that it is investigating the matter and that the update will resume once all of the issues are resolved. The Android 4.3 update for the phone has also been pulled from FOTA and Samsung Kies.
Meanwhile, Samsung is also experiencing problems with the Android 4.3 update in the U.S., this time for the AT&T version of the Samsung Galaxy S4. In this case, there is no indication why the update was pulled. It was just last Wednesday when Android 4.3 started rolling out to AT&T customers sporting the latest Android flagship model.
Samsung's Android 4.3 update brings support for the Galaxy Gear smartwatch, and includes Samsung KNOX. The latter is a "secure container" for business use that includes a browser, calendar, email and contacts.
source: SamMobile via TechRadar